RFR: Added section for newcomers [v9]

[Jesper Wilhelmsson]

On Mon, 7 Dec 2020 18:33:53 GMT, Iris Clark <iris at openjdk.org> wrote:

>> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Updated text
>
> Marked as reviewed by iris (Reviewer).

Thank you, all reviewers!

-------------

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