RFR: Roles in the OpenJDK [v4]

[Jesper Wilhelmsson]

> Added a short intro about OpenJDK describing Groups, Projects, and different roles. The sections on how to progress through the Author, Committer, Reviewer roles needs a broad agreement since that's an area that affects everyone and where there historically has been a lot of debate. This is a first draft, please comment.

Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:

  one of

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Changes:
  - all: https://git.openjdk.java.net/guide/pull/60/files
  - new: https://git.openjdk.java.net/guide/pull/60/files/17755c8e..81ab5dca

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=guide&pr=60&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=guide&pr=60&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/guide/pull/60.diff
  Fetch: git fetch https://git.openjdk.java.net/guide pull/60/head:pull/60

PR: https://git.openjdk.java.net/guide/pull/60