Integrated: Added section for newcomers

[Jesper Wilhelmsson]

On Tue, 17 Nov 2020 04:26:31 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> Added a section to the introduction to set the expectations for new developers in the OpenJDK.
> 
> I also moved the mail list section up since it's also relevant in this context and should (imho) be the first thing to learn about when thinking about joining the community.

This pull request has now been integrated.

Changeset: 04211618
Author:    Jesper Wilhelmsson <jwilhelm at openjdk.org>
URL:       https://git.openjdk.java.net/guide/commit/04211618
Stats:     162 lines in 2 files changed: 115 ins; 47 del; 0 mod

Added section for newcomers

Reviewed-by: ihse, smarks, dholmes, iris

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