PMC onboarding guide

1. Use https://whimsy.apache.org you can check that you got added to the PMC list properly
2. Validate you are in the PMC group in JIRA and the Confluence Wiki
3. Subscribe to private@avro.apache.org; you can use whimsy to do this for whatever email account you want, or send mail from that mail address to private-subscribe@
4. You should have access also to https://reporter.apache.org which seeds our board reports
5. You can now access and read the private list archive (for linking to vote threads, etc) at https://lists.apache.org/list.html?private@avro.apache.org
6. Review the ASF PMC guides. There are a few, but you should re-read what the responsibilities are.
7. The PMC keeps a set of valuable resources in https://svn.apache.org/repos/private/pmc