Docs: Added CONTRIBUTING.md.

Reinmar · Reinmar · commit f8ccd7792453 · 2018-11-06T12:00:07.000+01:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
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+Contributing
+========================================
+
+See the [official contributors' guide to CKEditor 5](https://ckeditor.com/docs/ckeditor5/latest/framework/guides/contributing/contributing.html) to learn more about the general rules followed by the CKEditor 5 core team.
+
+See also the [Contributing](https://github.com/ckeditor/ckeditor5-angular#contributing) section of this specific package to learn more about contributing to this package.
