update README for doc
update README for doc

### What is this PR for?
Updating doc for the Zeppelin docs

### What type of PR is it?
Documentation

### Todos
* [x] - Update doc

### Is there a relevant Jira issue?
N/A

### How should this be tested?
N/A

### Screenshots (if appropriate)
N/A

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? This is

Author: Felix Cheung <felixcheung_m@hotmail.com>

Closes #723 from felixcheung/docreadme and squashes the following commits:

7bbf93a [Felix Cheung] typo
565a3a5 [Felix Cheung] update doc

vipul1409/zeppelin,soralee/zeppelin,Madhuka/incubator-zeppelin,namanmishra91/zeppelin,ravicodder/incubator-zeppelin,joroKr21/incubator-zeppelin,RamVenkatesh/incubator-zeppelin,rconline/zeppelin,astroshim/incubator-zeppelin,mfelgamal/zeppelin,mfelgamal/zeppelin,sctincman/zeppelin,rlugojr/incubator-zeppelin,mwpenny/zeppelin-esri,spacewalkman/incubator-zeppelin,nikste/incubator-zeppelin,astroshim/incubator-zeppelin,zetaris/zeppelin,igorborojevic/incubator-zeppelin,SachinJanani/zeppelin,vgmartinez/incubator-zeppelin,openthings/zeppelin,lresende/incubator-zeppelin,minahlee/zeppelin,yu74n/zeppelin,raysteam/zeppelin,Madhuka/incubator-zeppelin,jlagarden/zeppelin,apache/zeppelin,tillrohrmann/incubator-zeppelin,VipinRathor/zeppelin,zetaris/zeppelin,fogbeam/zeppelin_mirror,SarunasG/zeppelin-oidc,yu74n/zeppelin,hammertank/zeppelin,lresende/incubator-zeppelin,1ambda/zeppelin,chilang/zeppelin,minahlee/incubator-zeppelin,rconline/zeppelin,zjffdu/zeppelin,hkropp/incubator-zeppelin,astroshim/incubator-zeppelin,soralee/zeppelin,lobamba/zeppelin,karuppayya/zeppelin,hammertank/zeppelin,AlexanderShoshin/zeppelin,lresende/incubator-zeppelin,vipul1409/zeppelin,prasadwagle/incubator-zeppelin,IceKhan13/zeppelin,mwkang/zeppelin,datalayer/zeppelin,sohaibiftikhar/zeppelin,benoyantony/zeppelin,jongyoul/incubator-zeppelin,lobamba/zeppelin,mwkang/zeppelin,ankurmitujjain/incubator-zeppelin,pravin-dsilva/zeppelin,prabhjyotsingh/zeppelin,sergeymazin/zeppelin,Altiscale/incubator-zeppelin,sohaibiftikhar/zeppelin,mwpenny/zeppelin-esri,cris83/incubator-zeppelin,apache/incubator-zeppelin,Leemoonsoo/zeppelin,lobamba/zeppelin,Solution-Global/zeppelin,rerngvit/incubator-zeppelin,Altiscale/incubator-zeppelin,rlugojr/incubator-zeppelin,volumeint/zeppelin,herval/zeppelin,fogbeam/zeppelin_mirror,zjffdu/zeppelin,RamVenkatesh/incubator-zeppelin,raysteam/zeppelin,digitalreasoning/incubator-zeppelin,Nova-Boy/zeppelin,prabhjyotsingh/zeppelin,anthonycorbacho/incubator-zeppelin,chilang/zeppelin,IceKhan13/zeppelin,samuel-pt/incubator-zeppelin,wary/zeppelin,astroshim/incubator-zeppelin,joroKr21/incubator-zeppelin,digitalreasoning/incubator-zeppelin,Altiscale/incubator-zeppelin,rconline/zeppelin,volumeint/zeppelin,pravin-dsilva/zeppelin,prasadwagle/incubator-zeppelin,Solution-Global/zeppelin,cfries/zeppelin,Madhuka/incubator-zeppelin,brigade/incubator-zeppelin,yorek/zeppelin,lresende/incubator-zeppelin,datalayer/zeppelin,pravin-dsilva/zeppelin,IceKhan13/zeppelin,minahlee/zeppelin,sergeymazin/zeppelin,vrlo/zeppelin,apache/incubator-zeppelin,SachinJanani/zeppelin,Leemoonsoo/incubator-zeppelin,apache/incubator-zeppelin,optimizely/incubator-zeppelin,prasadwagle/incubator-zeppelin,IceKhan13/zeppelin,sagarkulkarni3592/incubator-zeppelin,ravicodder/incubator-zeppelin,AlexanderShoshin/zeppelin,jongyoul/incubator-zeppelin,sravan-s/zeppelin,yu74n/zeppelin,apache/incubator-zeppelin,radicalbit/incubator-zeppelin,namanmishra91/zeppelin,pellmont/zeppelin,r-kamath/incubator-zeppelin,tillrohrmann/incubator-zeppelin,Leemoonsoo/zeppelin,karuppayya/zeppelin,jlagarden/zeppelin,Altiscale/incubator-zeppelin,optimizely/incubator-zeppelin,radicalbit/incubator-zeppelin,lobamba/zeppelin,openthings/zeppelin,RamVenkatesh/incubator-zeppelin,suvam97/zeppelin,suvam97/zeppelin,sravan-s/zeppelin,Nova-Boy/zeppelin,r-kamath/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,pellmont/zeppelin,1ambda/zeppelin,minahlee/incubator-zeppelin,rlugojr/incubator-zeppelin,Leemoonsoo/zeppelin,tinkoff-dwh/zeppelin,cfries/zeppelin,mwkang/zeppelin,jongyoul/incubator-zeppelin,ravicodder/incubator-zeppelin,mwkang/zeppelin,apache/zeppelin,raysteam/zeppelin,tinkoff-dwh/zeppelin,jongyoul/zeppelin,sergeymazin/zeppelin,brigade/incubator-zeppelin,minahlee/incubator-zeppelin,apache/zeppelin,volumeint/zeppelin,Solution-Global/zeppelin,yu74n/zeppelin,AlexanderShoshin/zeppelin,volumeint/zeppelin,tinkoff-dwh/zeppelin,Madhuka/incubator-zeppelin,1ambda/zeppelin,ravicodder/incubator-zeppelin,cquptEthan/incubator-zeppelin,sagarkulkarni3592/incubator-zeppelin,soralee/zeppelin,Leemoonsoo/incubator-zeppelin,pravin-dsilva/zeppelin,sravan-s/zeppelin,cfries/zeppelin,doanduyhai/incubator-zeppelin,cris83/incubator-zeppelin,jongyoul/incubator-zeppelin,mfelgamal/zeppelin,ankurmitujjain/incubator-zeppelin,vipul1409/zeppelin,brigade/incubator-zeppelin,cquptEthan/incubator-zeppelin,astroshim/zeppelin,r-kamath/zeppelin,rconline/zeppelin,jongyoul/zeppelin,suvam97/zeppelin,granturing/incubator-zeppelin,cjmatta/incubator-zeppelin,pellmont/zeppelin,minahlee/zeppelin,suvam97/zeppelin,zetaris/zeppelin,vgmartinez/incubator-zeppelin,samuel-pt/incubator-zeppelin,herval/zeppelin,Altiscale/incubator-zeppelin,Nova-Boy/zeppelin,AlexanderShoshin/zeppelin,samuel-pt/incubator-zeppelin,AlexanderShoshin/zeppelin,yorek/zeppelin,sohaibiftikhar/zeppelin,astroshim/zeppelin,wary/zeppelin,wary/zeppelin,onkarshedge/incubator-zeppelin,namanmishra91/zeppelin,benoyantony/zeppelin,vgmartinez/incubator-zeppelin,vgmartinez/incubator-zeppelin,rerngvit/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,spacewalkman/incubator-zeppelin,tzolov/incubator-zeppelin,digitalreasoning/incubator-zeppelin,doanduyhai/incubator-zeppelin,joroKr21/incubator-zeppelin,YuanGunGun/zeppelin,Solution-Global/zeppelin,openthings/zeppelin,lresende/incubator-zeppelin,openthings/zeppelin,SachinJanani/zeppelin,spacewalkman/incubator-zeppelin,pravin-dsilva/zeppelin,doanduyhai/incubator-zeppelin,astroshim/zeppelin,Nova-Boy/zeppelin,apache/zeppelin,ankurmitujjain/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,apache/incubator-zeppelin,astroshim/zeppelin,jongyoul/zeppelin,sagarkulkarni3592/incubator-zeppelin,yu74n/zeppelin,joroKr21/incubator-zeppelin,suvam97/zeppelin,pellmont/zeppelin,optimizely/incubator-zeppelin,sergeymazin/zeppelin,onkarshedge/incubator-zeppelin,Leemoonsoo/zeppelin,zjffdu/zeppelin,hkropp/incubator-zeppelin,joroKr21/incubator-zeppelin,fogbeam/zeppelin_mirror,Nova-Boy/zeppelin,vipul1409/zeppelin,rconline/zeppelin,fogbeam/zeppelin_mirror,mwpenny/zeppelin-esri,sohaibiftikhar/zeppelin,rerngvit/incubator-zeppelin,doanduyhai/incubator-zeppelin,nikste/incubator-zeppelin,datalayer/zeppelin-datalayer,rconline/zeppelin,mfelgamal/zeppelin,1ambda/zeppelin,doanduyhai/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,jongyoul/zeppelin,minahlee/incubator-zeppelin,yorek/zeppelin,1ambda/zeppelin,hkropp/incubator-zeppelin,VipinRathor/zeppelin,pellmont/zeppelin,mwkang/zeppelin,cquptEthan/incubator-zeppelin,karuppayya/zeppelin,yu74n/zeppelin,granturing/incubator-zeppelin,sravan-s/zeppelin,hammertank/zeppelin,anthonycorbacho/incubator-zeppelin,hammertank/zeppelin,sagarkulkarni3592/incubator-zeppelin,vrlo/zeppelin,raysteam/zeppelin,sergeymazin/zeppelin,datalayer/zeppelin,prabhjyotsingh/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,zjffdu/zeppelin,sohaibiftikhar/zeppelin,r-kamath/incubator-zeppelin,onkarshedge/incubator-zeppelin,raysteam/zeppelin,pravin-dsilva/zeppelin,soralee/zeppelin,sravan-s/zeppelin,Nova-Boy/zeppelin,granturing/incubator-zeppelin,SachinJanani/zeppelin,vrlo/zeppelin,samuel-pt/incubator-zeppelin,zetaris/zeppelin,spacewalkman/incubator-zeppelin,optimizely/incubator-zeppelin,onkarshedge/incubator-zeppelin,prabhjyotsingh/zeppelin,benoyantony/zeppelin,suvam97/zeppelin,tinkoff-dwh/zeppelin,igorborojevic/incubator-zeppelin,SarunasG/zeppelin-oidc,prasadwagle/incubator-zeppelin,IceKhan13/zeppelin,volumeint/zeppelin,apache/zeppelin,datalayer/zeppelin,mfelgamal/zeppelin,igorborojevic/incubator-zeppelin,sravan-s/zeppelin,tillrohrmann/incubator-zeppelin,fogbeam/zeppelin_mirror,herval/zeppelin,Madhuka/incubator-zeppelin,chilang/zeppelin,digitalreasoning/incubator-zeppelin,r-kamath/zeppelin,nikste/incubator-zeppelin,spacewalkman/incubator-zeppelin,lobamba/zeppelin,sagarkulkarni3592/incubator-zeppelin,prabhjyotsingh/zeppelin,tinkoff-dwh/zeppelin,vrlo/zeppelin,rerngvit/incubator-zeppelin,brigade/incubator-zeppelin,vgmartinez/incubator-zeppelin,karuppayya/zeppelin,sctincman/zeppelin,Solution-Global/zeppelin,cjmatta/incubator-zeppelin,radicalbit/incubator-zeppelin,raysteam/zeppelin,datalayer/zeppelin,r-kamath/incubator-zeppelin,chilang/zeppelin,wary/zeppelin,onkarshedge/incubator-zeppelin,soralee/zeppelin,sctincman/zeppelin,Nova-Boy/zeppelin,wary/zeppelin,ankurmitujjain/incubator-zeppelin,mwkang/zeppelin,YuanGunGun/zeppelin,cjmatta/incubator-zeppelin,lobamba/zeppelin,lresende/incubator-zeppelin,granturing/incubator-zeppelin,nikste/incubator-zeppelin,rerngvit/incubator-zeppelin,cquptEthan/incubator-zeppelin,spacewalkman/incubator-zeppelin,prabhjyotsingh/incubator-zeppelin,namanmishra91/zeppelin,Solution-Global/zeppelin,minahlee/zeppelin,ravicodder/incubator-zeppelin,tzolov/incubator-zeppelin,datalayer/zeppelin-datalayer,astroshim/incubator-zeppelin,doanduyhai/incubator-zeppelin,SachinJanani/zeppelin,fogbeam/zeppelin_mirror,SarunasG/zeppelin-oidc,cris83/incubator-zeppelin,r-kamath/zeppelin,vipul1409/zeppelin,vipul1409/zeppelin,yorek/zeppelin,mwpenny/zeppelin-esri,r-kamath/zeppelin,digitalreasoning/incubator-zeppelin,Leemoonsoo/zeppelin,granturing/incubator-zeppelin,SarunasG/zeppelin-oidc,hammertank/zeppelin,prabhjyotsingh/incubator-zeppelin,optimizely/incubator-zeppelin,jongyoul/zeppelin,jlagarden/zeppelin,tillrohrmann/incubator-zeppelin,sagarkulkarni3592/incubator-zeppelin,rerngvit/incubator-zeppelin,granturing/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,jlagarden/zeppelin,Madhuka/incubator-zeppelin,joroKr21/incubator-zeppelin,RamVenkatesh/incubator-zeppelin,r-kamath/incubator-zeppelin,namanmishra91/zeppelin,IceKhan13/zeppelin,cjmatta/incubator-zeppelin,chilang/zeppelin,mfelgamal/zeppelin,volumeint/zeppelin,ravicodder/incubator-zeppelin,sagarkulkarni3592/incubator-zeppelin,Leemoonsoo/incubator-zeppelin,samuel-pt/incubator-zeppelin,jongyoul/zeppelin,jlagarden/zeppelin,apache/incubator-zeppelin,herval/zeppelin,wary/zeppelin,astroshim/zeppelin,brigade/incubator-zeppelin,tinkoff-dwh/zeppelin,radicalbit/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,r-kamath/zeppelin,rconline/zeppelin,cfries/zeppelin,hkropp/incubator-zeppelin,Leemoonsoo/zeppelin,apache/zeppelin,SarunasG/zeppelin-oidc,tzolov/incubator-zeppelin,ankurmitujjain/incubator-zeppelin,sergeymazin/zeppelin,chilang/zeppelin,cjmatta/incubator-zeppelin,igorborojevic/incubator-zeppelin,yorek/zeppelin,datalayer/zeppelin,herval/zeppelin,prabhjyotsingh/incubator-zeppelin,Leemoonsoo/zeppelin,cfries/zeppelin,minahlee/incubator-zeppelin,sctincman/zeppelin,mwpenny/zeppelin-esri,mwpenny/zeppelin-esri,sctincman/zeppelin,doanduyhai/incubator-zeppelin,zjffdu/zeppelin,namanmishra91/zeppelin,YuanGunGun/zeppelin,r-kamath/zeppelin,sohaibiftikhar/zeppelin,cquptEthan/incubator-zeppelin,VipinRathor/zeppelin,tzolov/incubator-zeppelin,onkarshedge/incubator-zeppelin,VipinRathor/zeppelin,anthonycorbacho/incubator-zeppelin,zetaris/zeppelin,tillrohrmann/incubator-zeppelin,astroshim/incubator-zeppelin,tillrohrmann/incubator-zeppelin,prabhjyotsingh/zeppelin,zjffdu/zeppelin,openthings/zeppelin,Leemoonsoo/zeppelin,igorborojevic/incubator-zeppelin,VipinRathor/zeppelin,datalayer/zeppelin-datalayer,samuel-pt/incubator-zeppelin,brigade/incubator-zeppelin,yorek/zeppelin,1ambda/zeppelin,benoyantony/zeppelin,igorborojevic/incubator-zeppelin,jlagarden/zeppelin,prasadwagle/incubator-zeppelin,jongyoul/incubator-zeppelin,cquptEthan/incubator-zeppelin,onkarshedge/incubator-zeppelin,YuanGunGun/zeppelin,volumeint/zeppelin,karuppayya/zeppelin,yorek/zeppelin,SarunasG/zeppelin-oidc,lresende/incubator-zeppelin,zjffdu/zeppelin,karuppayya/zeppelin,AlexanderShoshin/zeppelin,radicalbit/incubator-zeppelin,sctincman/zeppelin,zetaris/zeppelin,VipinRathor/zeppelin,benoyantony/zeppelin,minahlee/zeppelin,SachinJanani/zeppelin,AlexanderShoshin/zeppelin,cris83/incubator-zeppelin,YuanGunGun/zeppelin,ravicodder/incubator-zeppelin,jongyoul/zeppelin,chilang/zeppelin,r-kamath/incubator-zeppelin,Solution-Global/zeppelin,tzolov/incubator-zeppelin,astroshim/zeppelin,mfelgamal/zeppelin,cris83/incubator-zeppelin,pellmont/zeppelin,cjmatta/incubator-zeppelin,rerngvit/incubator-zeppelin,vrlo/zeppelin,digitalreasoning/incubator-zeppelin,jlagarden/zeppelin,sravan-s/zeppelin,cris83/incubator-zeppelin,hammertank/zeppelin,sohaibiftikhar/zeppelin,hkropp/incubator-zeppelin,cquptEthan/incubator-zeppelin,cfries/zeppelin,soralee/zeppelin,namanmishra91/zeppelin,lobamba/zeppelin,vrlo/zeppelin,zetaris/zeppelin,herval/zeppelin,yu74n/zeppelin,mwkang/zeppelin,SarunasG/zeppelin-oidc,cfries/zeppelin,benoyantony/zeppelin,ankurmitujjain/incubator-zeppelin,optimizely/incubator-zeppelin,ankurmitujjain/incubator-zeppelin,VipinRathor/zeppelin,minahlee/zeppelin,digitalreasoning/incubator-zeppelin,mwpenny/zeppelin-esri,pellmont/zeppelin,rlugojr/incubator-zeppelin,benoyantony/zeppelin,soralee/zeppelin,joroKr21/incubator-zeppelin,astroshim/zeppelin,datalayer/zeppelin-datalayer,brigade/incubator-zeppelin,pravin-dsilva/zeppelin,vgmartinez/incubator-zeppelin,radicalbit/incubator-zeppelin,sergeymazin/zeppelin,prasadwagle/incubator-zeppelin,herval/zeppelin,radicalbit/incubator-zeppelin,r-kamath/incubator-zeppelin,prabhjyotsingh/zeppelin,datalayer/zeppelin,hammertank/zeppelin,tinkoff-dwh/zeppelin,openthings/zeppelin,1ambda/zeppelin,vipul1409/zeppelin,prabhjyotsingh/zeppelin,Leemoonsoo/incubator-zeppelin,rlugojr/incubator-zeppelin,prasadwagle/incubator-zeppelin,Altiscale/incubator-zeppelin,fogbeam/zeppelin_mirror,suvam97/zeppelin,rlugojr/incubator-zeppelin,RamVenkatesh/incubator-zeppelin,optimizely/incubator-zeppelin,YuanGunGun/zeppelin,Madhuka/incubator-zeppelin,karuppayya/zeppelin,r-kamath/zeppelin,openthings/zeppelin,jongyoul/incubator-zeppelin,spacewalkman/incubator-zeppelin,apache/zeppelin,RamVenkatesh/incubator-zeppelin,wary/zeppelin,minahlee/zeppelin,SachinJanani/zeppelin,raysteam/zeppelin,sctincman/zeppelin,IceKhan13/zeppelin,YuanGunGun/zeppelin,nikste/incubator-zeppelin,tzolov/incubator-zeppelin,tillrohrmann/incubator-zeppelin,joroKr21/incubator-zeppelin,anthonycorbacho/incubator-zeppelin,hkropp/incubator-zeppelin,vrlo/zeppelin,granturing/incubator-zeppelin,nikste/incubator-zeppelin