Add Documentation for Project Guidelines (#14674)
Add Documentation for Project Guidelines (#14674)

This document is a replacement of our Confluence WIKI for the
guidelines agreed on the mailing list.

We can expand on this doc as we agree around Providers release,
some of the guidelines for core release, Helm chart etc.
cfei18/incubator-airflow,nathanielvarona/airflow,dhuang/incubator-airflow,sekikn/incubator-airflow,bolkedebruin/airflow,lyft/incubator-airflow,apache/airflow,lyft/incubator-airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,dhuang/incubator-airflow,apache/incubator-airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,nathanielvarona/airflow,sekikn/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,apache/airflow,mistercrunch/airflow,cfei18/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,apache/airflow,bolkedebruin/airflow,nathanielvarona/airflow,cfei18/incubator-airflow,mistercrunch/airflow,danielvdende/incubator-airflow,apache/incubator-airflow,dhuang/incubator-airflow,danielvdende/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,sekikn/incubator-airflow,apache/airflow,bolkedebruin/airflow,mistercrunch/airflow,cfei18/incubator-airflow,sekikn/incubator-airflow,bolkedebruin/airflow,dhuang/incubator-airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,mistercrunch/airflow,cfei18/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow