RFR: Added section for newcomers [v6]

[Marius Volkhart]

On Thu, 19 Nov 2020 04:58:18 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:
> 
>   Fixed typos

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.

One of the benefits of making the PR is that the openjdk bot tags the PR with the appropriate mailing list. Being a first time contributor, finding the relevant mailing list was not easy (there are just a lot of lists! �� ) - I was very relieved when the PR bot added the tag. I'm not suggesting this text be changed, just adding my experience.

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