RFR: Added section for newcomers [v7]

[Alan Bateman]

On Fri, 20 Nov 2020 03:51:19 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.
>
> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Less choking on coffee

src/index.md line 35:

> 33: ### 2. Socialize your change
> 34: 
> 35: Once the OCA is signed, please restrain your urge to create a PR just a little while longer. In order to prepare the community for your patch, please socialize your idea on the relevant [mailing lists](#mailing-lists). To understand the criteria by which your patch is going to be judged, please read [_Why is My Change Rejected?_](#why-is-my-change-rejected) below. In short, hidden constraints and assumptions, stability and quality, maintainability, compatibility, and conformance to specifications must be considered before your PR is ready to be submitted. If you don't understand the constraints for acceptance, you might be surprised when your PR is rejected.

I think proposals for API additions need to be called out here as a good example of something that needs discussion, and maybe agreement in principle, before going near code.

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