add Documentation section to the readme
add Documentation section to the readme

This should help to make clear that the http://activeadmin.info docu is out of date for 1.0
sanyaade-iot/activeadmin,MohamedHegab/activeadmin,shishir127/activeadmin,vraravam/activeadmin,zfben/activeadmin,seanski/activeadmin,siutin/activeadmin,strivedi183/activeadmin,bloomrain/activeadmin,hobbes37/activeadmin,danielevans/activeadmin,sanyaade-iot/activeadmin,danielevans/activeadmin,SoftSwiss/active_admin,deivid-rodriguez/activeadmin,samvincent/active_admin,temochka-test/activeadmin,activeadmin/activeadmin,wspurgin/activeadmin,mrjman/activeadmin,totzyuta/activeadmin,hobbes37/activeadmin,mrjman/activeadmin,h2ocube/active_admin,senid231/activeadmin,mauriciopasquier/active_admin,alonerage/activeadmin,deivid-rodriguez/activeadmin,presskey/activeadmin,maysam/activeadmin,beyondthestory/activeadmin,Amandeepsinghghai/activeadmin,buren/activeadmin,jclay/active_admin,iguchi1124/activeadmin,iuriandreazza/activeadmin,rtrepo/activeadmin,activeadmin/activeadmin,zfben/activeadmin,applexiaohao/activeadmin,artofhuman/activeadmin,maysam/activeadmin,mateusg/active_admin,halilim/activeadmin,javierjulio/activeadmin,westonplatter/activeadmin,getkiwicom/activeadmin,beyondthestory/activeadmin,krautcomputing/activeadmin,Skulli/activeadmin,scarver2/activeadmin,Davidzhu001/activeadmin,rubixware/activeadmin,Skulli/activeadmin,Pollywog23/activeadmin,MohamedHegab/activeadmin,lampo/activeadmin,saiqulhaq/activeadmin,vytenis-s/activeadmin,keichan34/active_admin,dannyshafer/activeadmin,saveav/activeadmin,chdem/activeadmin,mynksngh/activeadmin,timoschilling/activeadmin,Some1Else/activeadmin,sanyaade-iot/activeadmin,Davidzhu001/activeadmin,mateusg/active_admin,Pollywog23/activeadmin,gogovan/activeadmin,dannyshafer/activeadmin,hiroponz/activeadmin,Ibotta/activeadmin,vraravam/activeadmin,Amandeepsinghghai/activeadmin,bloomrain/activeadmin,waymondo/active_admin,quikly/active_admin,iuriandreazza/activeadmin,FundingGates/activeadmin,jclay/active_admin,thomascarterx/activeadmin,artofhuman/activeadmin,yijiasu/activeadmin,dhartoto/activeadmin,dalegregory/activeadmin,JeffreyATW/activeadmin,Some1Else/activeadmin,tjgrathwell/activeadmin,scarver2/activeadmin,bcavileer/activeadmin,buren/activeadmin,getkiwicom/activeadmin,iuriandreazza/activeadmin,Ryohu/activeadmin,activeadmin/activeadmin,tf/activeadmin,totzyuta/activeadmin,senid231/activeadmin,quikly/active_admin,jethroo/activeadmin,hobbes37/activeadmin,bloomrain/activeadmin,yeti-switch/active_admin,iguchi1124/activeadmin,javierjulio/activeadmin,ishumilova/activeadmin,dhartoto/activeadmin,sharma1nitish/activeadmin,varyonic/activeadmin,hiroponz/activeadmin,adibsaad/activeadmin,JeffreyATW/activeadmin,thomascarterx/activeadmin,dhartoto/activeadmin,jethroo/activeadmin,alonerage/activeadmin,ampinog/activeadmin,temochka-test/activeadmin,timoschilling/activeadmin,mauriciopasquier/active_admin,bolshakov/activeadmin,Andrekra/activeadmin,tf/activeadmin,mauriciopasquier/active_admin,davydovanton/activeadmin,whatcould/active_admin,Davidzhu001/activeadmin,saiqulhaq/activeadmin,samvincent/active_admin,scarver2/activeadmin,yeti-switch/active_admin,dalegregory/activeadmin,Ibotta/activeadmin,siutin/activeadmin,jclay/active_admin,yijiasu/activeadmin,hyperoslo/activeadmin,varyonic/activeadmin,totzyuta/activeadmin,tjgrathwell/activeadmin,westonplatter/activeadmin,FundingGates/activeadmin,MohamedHegab/activeadmin,Ryohu/activeadmin,thomascarterx/activeadmin,yeti-switch/active_admin,cmunozgar/activeadmin,presskey/activeadmin,shishir127/activeadmin,saveav/activeadmin,mrjman/activeadmin,yijiasu/activeadmin,javierjulio/activeadmin,lampo/activeadmin,westonplatter/activeadmin,ishumilova/activeadmin,rubixware/activeadmin,hyperoslo/activeadmin,whatcould/active_admin,ampinog/activeadmin,mynksngh/activeadmin,krautcomputing/activeadmin,mateusg/active_admin,seanski/activeadmin,mohitnatoo/activeadmin,h2ocube/active_admin,Ryohu/activeadmin,vraravam/activeadmin,JeffreyATW/activeadmin,vytenis-s/activeadmin,jethroo/activeadmin,chrisseldo/activeadmin,sharma1nitish/activeadmin,SoftSwiss/active_admin,rtrepo/activeadmin,iuriandreazza/activeadmin,krautcomputing/activeadmin,chdem/activeadmin,FundingGates/activeadmin,wspurgin/activeadmin,siutin/activeadmin,rtrepo/activeadmin,samvincent/active_admin,chdem/activeadmin,getkiwicom/activeadmin,iuriandreazza/activeadmin,hiroponz/activeadmin,alonerage/activeadmin,lampo/activeadmin,davydovanton/activeadmin,temochka-test/activeadmin,adibsaad/activeadmin,gogovan/activeadmin,halilim/activeadmin,mwlang/active_admin,bcavileer/activeadmin,waymondo/active_admin,applexiaohao/activeadmin,Skulli/activeadmin,saiqulhaq/activeadmin,Andrekra/activeadmin,iuriandreazza/activeadmin,mwlang/active_admin,buren/activeadmin,halilim/activeadmin,SoftSwiss/active_admin,mohitnatoo/activeadmin,wspurgin/activeadmin,Amandeepsinghghai/activeadmin,maysam/activeadmin,deivid-rodriguez/activeadmin,bolshakov/activeadmin,iguchi1124/activeadmin,adibsaad/activeadmin,cmunozgar/activeadmin,danielevans/activeadmin,bcavileer/activeadmin,quikly/active_admin,gogovan/activeadmin,dalegregory/activeadmin,bolshakov/activeadmin,shishir127/activeadmin,sharma1nitish/activeadmin,senid231/activeadmin,mynksngh/activeadmin,waymondo/active_admin,hyperoslo/activeadmin,mediebruket/activeadmin,tf/activeadmin,h2ocube/active_admin,ishumilova/activeadmin,tjgrathwell/activeadmin,vytenis-s/activeadmin,timoschilling/activeadmin,Some1Else/activeadmin,chrisseldo/activeadmin,mediebruket/activeadmin,artofhuman/activeadmin,ampinog/activeadmin,Ibotta/activeadmin,varyonic/activeadmin,applexiaohao/activeadmin,mohitnatoo/activeadmin,presskey/activeadmin,keichan34/active_admin,iuriandreazza/activeadmin,davydovanton/activeadmin,strivedi183/activeadmin,Andrekra/activeadmin,mediebruket/activeadmin,beyondthestory/activeadmin,seanski/activeadmin,rubixware/activeadmin,whatcould/active_admin,zfben/activeadmin,keichan34/active_admin,mwlang/active_admin,chrisseldo/activeadmin,strivedi183/activeadmin,dannyshafer/activeadmin,saveav/activeadmin,cmunozgar/activeadmin,Pollywog23/activeadmin