RFR: Added section for newcomers [v3]

[Jesper Wilhelmsson]

On Wed, 18 Nov 2020 21:20:15 GMT, Stuart Marks <smarks at openjdk.org> wrote:

>> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Roles and JBS
>
> src/index.md line 45:
> 
>> 43: Many OpenJDK projects require a tracking issue to be filed in the [JDK Bug System (JBS)](https://bugs.openjdk.java.net/) before a change can be pushed. This is the case for instance for the JDK and the JDK-Updates projects. In order to get write access to JBS you need to be an [Author](https://openjdk.java.net/bylaws#author) in an OpenJDK project. For your first changes, ask your sponsor to help you create the issue.
>> 44: 
>> 45: If you continue to contribute high-quality content you'll soon enough be eligible for OpenJDK roles in the project. First Author, and later Contributor. The Contributor role means you won't need a sponsor anymore. You can read more about [OpenJDK Project Roles](https://openjdk.java.net/bylaws#project-roles).
> 
> I think you mean **Committer** here, not Contributor.

Oops.. Yes Committer is right.  Thanks!

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PR: https://git.openjdk.java.net/guide/pull/38