Updated Readme.md to include git client
Updated Readme.md to include git client

`go get ` command requires git client to be present in the system to work, so added the instruction to get git installed with golang package.

Signed-off-by: Ranjandas <80d32c503a272b5cea3bc2890e89900a8c8351f6@gmail.com>

rancher/swarm,unodba/swarm,alexisbellido/docker.github.io,denverdino/denverdino.github.io,bdwill/docker.github.io,linecheng/swarm,doronp/swarm,docker/docker.github.io,christophelec/swarm,denverdino/swarm,BSWANG/denverdino.github.io,denverdino/docker.github.io,parapsyche/swarm,bpradipt/swarm,mrjana/swarm,cpuguy83/swarm,joaofnfernandes/docker.github.io,kyhavlov/swarm,bsmr-docker/swarm,rchicoli/swarm,sanscontext/docker.github.io,danix800/docker.github.io,docker-zh/docker.github.io,megamsys/swarm,resouer/swarm,phiroict/docker,shubheksha/docker.github.io,LuisBosquez/docker.github.io,morpheyesh/swarm,adouang/swarm,johnstep/docker.github.io,ricca742/swarm,FreedomWangLi/swarm,mrjana/swarm,mavenugo/swarm,pdevine/swarm,sfsmithcha/swarm,therealbill/swarm,denverdino/swarm-1,marsmensch/swarm,shin-/docker.github.io,anweiss/docker.github.io,alexisbellido/docker.github.io,phiroict/docker,vlajos/swarm,anweiss/docker.github.io,schmunk42/swarm,morpheyesh/swarm,docker/docker.github.io,barais/swarm,joeuo/docker.github.io,doronp/swarm,docker/docker.github.io,rav121/swarm,sanscontext/docker.github.io,JimGalasyn/docker.github.io,sanscontext/docker.github.io,troy0820/docker.github.io,gonkulator/swarm,liubin/swarm,londoncalling/docker.github.io,jimenez/swarm,mavenugo/swarm,CiaranCostello/swarm,joeuo/docker.github.io,ch3lo/swarm,u2mejc/swarm,Aorjoa/swarm,EderRoger/swarm,menglingwei/denverdino.github.io,aidora/pisces,cgvarela/swarm,dims/swarm,chanwit/swarm,Spritekin/swarm,joeuo/docker.github.io,thaJeztah/docker.github.io,LukasBacigal/swarm,ezrasilvera/SwarmACLs,akerbis/armhf-swarm,raoofm/swarm,sanscontext/docker.github.io,rutulpatel/swarm,liubin/swarm,BSWANG/denverdino.github.io,denverdino/docker.github.io,joeuo/docker.github.io,polyverse-security/swarm,docker-zh/docker.github.io,menglingwei/denverdino.github.io,jimenez/swarm,cpuguy83/swarm,jimmycmh/swarm,ezrasilvera/swarm,gradywang/swarm,anweiss/docker.github.io,jzwlqx/denverdino.github.io,iaintshine/swarm,phiroict/docker,deis/swarm,johnstep/docker.github.io,shubheksha/docker.github.io,cgvarela/swarm,londoncalling/docker.github.io,PeoplePerHour/libswarm,jay-lau/swarm,riuvshin/swarm,JimGalasyn/docker.github.io,londoncalling/docker.github.io,denverdino/denverdino.github.io,bdwill/docker.github.io,everett-toews/swarm,francisbouvier/swarm,jay-lau/swarm,resouer/swarm,FollowMyDev/swarm,schmunk42/swarm,adouang/swarm,LuisBosquez/docker.github.io,danix800/docker.github.io,rillig/docker.github.io,swarm-hooks/swarm,pssahi/swarm,fugr/swarm,rajdeepd/swarm,londoncalling/docker.github.io,mountkin/swarm,anweiss/docker.github.io,docker-zh/docker.github.io,jdamick/swarm,thaJeztah/docker.github.io,johnstep/docker.github.io,linecheng/swarm,rillig/docker.github.io,errordeveloper/swarm,shot/swarm,alexisbellido/docker.github.io,PeoplePerHour/libswarm,dims/swarm,raoofm/swarm,CodeNow/swarm,joaofnfernandes/docker.github.io,mgoelzer/swarm,pssahi/swarm,jimmycmh/swarm,LuisBosquez/docker.github.io,SivagnanamCiena/swarm,johnstep/docker.github.io,phiroict/docker,bdwill/docker.github.io,tranceitionalMynd/swarm,MHBauer/swarm,jeffjen/swarm,denverdino/swarm-1,snrism/swarm,denverdino/docker.github.io,ealang/swarm,bpradipt/swarm,u2mejc/swarm,bdwill/docker.github.io,echupriyanov/swarm,polyverse-security/swarm,JimGalasyn/docker.github.io,rav121/swarm,docker-zh/docker.github.io,sanscontext/docker.github.io,docker/docker.github.io,unodba/swarm,shin-/docker.github.io,CodeNow/swarm,moxiegirl/swarm,auzias/swarm,aduermael/docker.github.io,jimmyxian/swarm,menglingwei/denverdino.github.io,troy0820/docker.github.io,aduermael/docker.github.io,thaJeztah/docker.github.io,rancher/swarm,tangkun75/swarm,pdevine/swarm,bsmr-docker/swarm,deis/swarm,kunalkushwaha/swarm,docker/docker.github.io,denverdino/docker.github.io,Aorjoa/swarm,sfsmithcha/swarm,LukasBacigal/swarm,zkcrescent/swarm,troy0820/docker.github.io,megamsys/swarm,JimGalasyn/docker.github.io,mountkin/swarm,JimGalasyn/docker.github.io,denverdino/swarm,francisbouvier/swarm,docker-zh/docker.github.io,shubheksha/docker.github.io,alexisbellido/docker.github.io,ehazlett/swarm,jzwlqx/denverdino.github.io,aidora/pisces,aduermael/docker.github.io,FollowMyDev/swarm,atlassian/swarm,iaintshine/swarm,shin-/docker.github.io,denverdino/denverdino.github.io,jzwlqx/denverdino.github.io,qianzhangxa/swarm,joaofnfernandes/docker.github.io,ezrasilvera/swarm,krystism/swarm,aduermael/docker.github.io,shin-/docker.github.io,gdevillele/docker.github.io,LuisBosquez/docker.github.io,alexisbellido/docker.github.io,akerbis/armhf-swarm,kunalkushwaha/swarm,therealbill/swarm,christophelec/swarm,danix800/docker.github.io,rchicoli/swarm,shubheksha/docker.github.io,joaofnfernandes/docker.github.io,shahankhatch/swarm,joaofnfernandes/docker.github.io,swarm-hooks/swarm,gdevillele/docker.github.io,atlassian/swarm,EderRoger/swarm,allencloud/swarm,jeffjen/swarm,ezrasilvera/SwarmACLs,snrism/swarm,Spritekin/swarm,zkcrescent/swarm,NunoEdgarGub1/swarm,mgoelzer/swarm,gdevillele/docker.github.io,londoncalling/docker.github.io,marsmensch/swarm,riuvshin/swarm,affo/swarm,dnephin/swarm,SivagnanamCiena/swarm,gdevillele/docker.github.io,beni55/swarm-1,yp-engineering/swarm,abronan/swarm,joeuo/docker.github.io,errordeveloper/swarm,MHBauer/swarm,rillig/docker.github.io,gradywang/swarm,NunoEdgarGub1/swarm,jzwlqx/denverdino.github.io,ricca742/swarm,anweiss/docker.github.io,kyhavlov/swarm,ejholmes/swarm,danix800/docker.github.io,phiroict/docker,denverdino/denverdino.github.io,echupriyanov/swarm,BSWANG/denverdino.github.io,beni55/swarm-1,LuisBosquez/docker.github.io,BSWANG/denverdino.github.io,gdevillele/docker.github.io,auzias/swarm,shahankhatch/swarm,tangkun75/swarm,chanwit/swarm,thaJeztah/docker.github.io,thaJeztah/docker.github.io,johnstep/docker.github.io,rutulpatel/swarm,parapsyche/swarm,rillig/docker.github.io,affo/swarm,ch3lo/swarm,BSWANG/swarm,yp-engineering/swarm,denverdino/docker.github.io,denverdino/denverdino.github.io,tranceitionalMynd/swarm,troy0820/docker.github.io,xFragger/swarm,abronan/swarm,everett-toews/swarm,BSWANG/denverdino.github.io,shubheksha/docker.github.io,qianzhangxa/swarm,FreedomWangLi/swarm,dnephin/swarm,fugr/swarm,allencloud/swarm,barais/swarm,vlajos/swarm,menglingwei/denverdino.github.io,BSWANG/swarm,srikalyan/swarm,CiaranCostello/swarm,moxiegirl/swarm,jdamick/swarm,ehazlett/swarm,jimmyxian/swarm,bdwill/docker.github.io,ejholmes/swarm,menglingwei/denverdino.github.io,xFragger/swarm,shin-/docker.github.io,rajdeepd/swarm,shot/swarm,jzwlqx/denverdino.github.io,srikalyan/swarm,krystism/swarm,ealang/swarm,gonkulator/swarm