Add GitHub templates

.github/pull_request_template.md

@@ -0,0 +1,10 @@
+<!-- Please tick if the following things apply. You… -->
+
+- [] read the [CONTRIBUTING guidelines](README.md#user-content-contributing)
+- [] raised a GitHub issue or discussed it on the projects chat beforehand
+- [] added unit tests
+- [] added integration tests
+- [] updated documentation if needed
+- [] updated CHANGELOG.md
+
+<!-- If applicable, please reference the issue using `Fixes #XXX` and add tests to cover your new code. -->