Add link to README.rst for developer setup (#1516)
Add link to README.rst for developer setup (#1516)

* Add link to README.rst for developer setup

Fixes #1514, fixes #889

* Code review fix.

QingChenmsft/azure-cli,samedder/azure-cli,yugangw-msft/azure-cli,QingChenmsft/azure-cli,yugangw-msft/azure-cli,QingChenmsft/azure-cli,yugangw-msft/azure-cli,yugangw-msft/azure-cli,samedder/azure-cli,yugangw-msft/azure-cli,samedder/azure-cli,yugangw-msft/azure-cli,QingChenmsft/azure-cli,samedder/azure-cli