CONTRIBUTING: document our suboptimal MR process

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+Contributing
+============
+
+Please file issues and merge requests against the upstream repository:
+
+[https://gitlab.nic.cz/knot/knot-resolver](https://gitlab.nic.cz/knot/knot-resolver)
+
+Opening a merge request on gitlab.nic.cz
+----------------------------------------
+
+Unfortunately, due to administrative policy, forking is disabled by default. To
+be able to fork, please send us an e-mail with your username to knot-resolver@labs.nic.cz
+
+We apologize for the inconvenience and if you can't be bothered, please
+consider alternate ways of contributing, such as:
+
+- Opening a pull request on [github.com](https://github.com/CZ-NIC/knot-resolver).
+  We'll take care of it and move it to our upstream.
+- Sending a patch to the users list: knot-resolver-users@lists.nic.cz