Create pull_request_template.md (#262)

Depends on #260

.github/pull_request_template.md

@@ -0,0 +1,7 @@
+<!-- 
+The following is a disclaimer. Since all content in the repository is licensed under AGPL-3.0, 
+the terms of the license apply to your contributions as well.
+Please make sure that all code or other content you're contributing is your own, or is licensed under
+an AGPL-3.0 compatible license.
+-->
+These contributions are my own and I own all rights to them. I understand and agree that these contributions are licensed under [AGPL-3.0](https://www.gnu.org/licenses/agpl-3.0.en.html).