Installation details for README
Installation details for README

Per issue: https://github.com/nextcloud/server/issues/16
Added installation link guides per the already established documentation rather than attempting to re-create the documentation here.
whitekiba/server,whitekiba/server,whitekiba/server,pmattern/server,pixelipo/server,nextcloud/server,jbicha/server,pmattern/server,nextcloud/server,endsguy/server,endsguy/server,Ardinis/server,Ardinis/server,pmattern/server,xx621998xx/server,nextcloud/server,whitekiba/server,jbicha/server,pixelipo/server,pixelipo/server,michaelletzgus/nextcloud-server,andreas-p/nextcloud-server,pixelipo/server,pmattern/server,michaelletzgus/nextcloud-server,Ardinis/server,jbicha/server,xx621998xx/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,xx621998xx/server,andreas-p/nextcloud-server,jbicha/server,endsguy/server,xx621998xx/server,pmattern/server,michaelletzgus/nextcloud-server,Ardinis/server,xx621998xx/server,endsguy/server,Ardinis/server,endsguy/server,andreas-p/nextcloud-server,nextcloud/server,michaelletzgus/nextcloud-server,pixelipo/server,whitekiba/server,jbicha/server