CONTRIBUTING.md: add a notice about licensing

This suplements changes from #11557; see the long discussion.
This commit is contained in:
Vladimír Čunát 2015-12-19 14:34:58 +01:00
parent af6732e503
commit 0ad7b1f44a

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# How to contribute
Note: contributing implies licensing those contributions
under the terms of [COPYING](./COPYING), which is an MIT-like license.
## Opening issues
* Make sure you have a [GitHub account](https://github.com/signup/free)