Vendor Magnum and Corrade sources

third_party/magnum-integration/CONTRIBUTING.md

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+Bug reports, feature requests or code contributions are always very welcome.
+To make things easier, here are a few tips:
+
+Reporting bugs, requesting features
+-----------------------------------
+
+-   Best way to report bugs and request new features is to use GitHub
+    [Issues](https://github.com/mosra/magnum-integration/issues), but you can
+    contact the team also any other way — see the [README](README.md) for
+    details.
+
+Code contribution
+-----------------
+
+-   Best way to contribute is using GitHub [Pull Requests](https://github.com/mosra/magnum-integration/pulls)
+    — fork the repository and make a pull request from a feature branch. You
+    can also send patches via e-mail or contact the team in any other way — see
+    the [README](README.md) for details.
+-   Follow the project coding guidelines. In short — try to match style of the
+    surrounding code and avoid any trailing whitespace. When in doubt, consult
+    [Coding Style](https://doc.magnum.graphics/magnum/coding-style.html)
+    guidelines.
+-   There's a [Developers Guide](https://doc.magnum.graphics/magnum/developers.html)
+    providing step-by-step checklists for almost every development aspect. It's
+    not strictly required to follow it to the point, but doing so will save the
+    maintainers a lot of time during review and merging.
+-   All your code will be released under the project license (see the
+    [COPYING](COPYING) file for details), so make sure you and your
+    collaborators (or employers) have no problems with it.