RFR: Added section for newcomers [v6]

[Jesper Wilhelmsson]

On Thu, 19 Nov 2020 08:54:17 GMT, Anthony Vanelverdinghe <github.com+15714253+anthonyvdotbe at openjdk.org> wrote:

>> Jesper Wilhelmsson has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixed typos
>
> README.md line 38:
> 
>> 36: * List JTReg `@key` conventions for different areas
>> 37: * Document best practices around TEST.properties usage. See [PR#30](https://github.com/openjdk/guide/pull/30#issuecomment-714589551)
>> 38: * How to work with the code in an IDE
> 
> This would be a great addition. There's already the [IDE Tooling & Support Group](https://openjdk.java.net/groups/ide-support/), but AFAICT it hasn't produced any documentation yet (though there's a [post](https://mail.openjdk.java.net/pipermail/ide-support-dev/2020-April/000030.html) by Bradford Wetmore on his NetBeans setup).

Yes, I have Brad's mail in my inbox and it's on my todo list to turn that into a section in the Guide.

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