Small PR to add a .gitignore

[Jesper Wilhelmsson]

Thanks!  Looks good.

The RFR thread and all other bot action around the integration will get going once your OCA is recognized by the bot.
/Jesper

> On 27 May 2020, at 15:43, Martijn Verburg <martijnverburg at gmail.com> wrote:
> 
> Hi all,
> 
> I noticed the build/ directory was a generated artifact so I've raised https://github.com/openjdk/guide/pull/11 <https://github.com/openjdk/guide/pull/11>
> 
> Cheers,
> Martijn

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