Create a welcoming and inclusive environment for new contributors

CONTRIBUTING.md

@@ -73,3 +73,20 @@ merging a merge request should be done locally, with prior rebasing upon the
 `master` branch and take care of using the `-ff-only` merge option. Merge
 requests should **NOT** be merged through the Gitlab UI, which would result in
 an extra "merge" commit.
+
+
+Getting your contribution accepted
+----------------------------------
+
+All contributions are welcome and will only be judged on a technical and legal merit.
+Contributing does not require endorsing views of any other contributor,
+or supporting the project in any way.
+
+Rejected contributions are not personal; further contributions will be considered.
+
+It is discouraged to inquire about any contributor opinions or
+identity characteristics as they should not have any influence on the quality
+of the contribution. It is also possible to contribute anonymously.
+
+If provided, icons are preferred to be parodic or humorous in nature for
+legal reasons, however there are no restrictions on the quality or style of humor.