For https://sparkr.atlassian.net/browse/SPARKR-109

What:
 - To prevent similar info on multiple place,  add refering user to README in git for latest info
 -  Add where to log issues and feedback, again refer to README as final truth.

Issue: https://sparkr.atlassian.net/browse/SPARKR-109

Can you also make the name tag "feedback-sparkr" ?