RFR: 7903693 Add contribution guidelines section [v2]

[Ludvig Janiuk]

On Thu, 14 Mar 2024 23:19:03 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Ludvig Janiuk has updated the pull request incrementally with three additional commits since the last revision:
>> 
>>  - x
>>  - x
>>  - final touches
>
> doc/building.md line 150:
> 
>> 148: One notable exception is the rule about case-sensitivity - jtreg's command line
>> 149: flags are case insensitive and due to backwards compatibility it seems 
>> 150: reasonable to keep this going forward.
> 
> Generally, it is good practice to not use time-dependent text, like "going forward", in any spec. 
> 
> I would replace the entire 148-150 lines with,
> 
> For backwards compatibility, `jtreg` option names are case-insensitive.

Good advice, I've adopted this language.

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PR Review Comment: https://git.openjdk.org/jtreg/pull/192#discussion_r1528942029