Document Permissions

[pnadolny13]

Document how we manage permissions and teams in the README.

I couldnt find the issue where we decided on the Teams structure and what permissions are given to each role but this breakdown seemed right.

Role: Access Level

• maintainer: maintain
• contributor: write
• community member (anyone): read
• admin (internal): admin

Were we planning to create a team per repo like "tap-google-analytics-contributor" and "..-maintainer"? What is the current iteration of the Teams? I dont have permission them.