Added git_stamp package

[arononak]

https://github.com/arononak/git_stamp
https://pub.dev/packages/git_stamp

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Checklist

• I read How to contribute
• I edited the SOURCE.md file only
• Added a link to the repo in the PR

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[Hanzhafiz]

@Hanzhafiz

[arononak]

@Solido Could you merge ?

[Solido]

I've already done the same package 6 years ago
https://github.com/Solido/build_flutter_version

And yet it still not have enough traction because it is too pecular of a subject.

We aim to curage most useful resource only, not every package.

Best regards

[arononak]

I see that you came up with such a brilliant idea as me Xd
Mine package is much more developed and in constant development. New functionality is released every week.

[arononak]

@Solido code on Macron, give me a marge Xd