added geting-started-with-r page
added geting-started-with-r page

k4rtik/docs,alexclarkofficial/docs,lfex/exercism-docs,exercism/DEPRECATED.help.exercism.io,ZacharyRSmith/docs,NobbZ/docs,exercism/DEPRECATED.help.exercism.io,canweriotnow/docs,k4rtik/docs,canweriotnow/docs,ZacharyRSmith/docs,lfex/exercism-docs,spazm/docs,rchavarria/docs,NobbZ/docs,arashbi/docs,yurrriq/docs,yurrriq/docs,rchavarria/docs,ekse/exercism-docs,ekse/exercism-docs,alexclarkofficial/docs,arashbi/docs,spazm/docs