root: add code of conduct and PR template

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

.github/pull_request_template.md

@@ -0,0 +1,19 @@
+<!--
+👋 Hello there! Welcome.
+
+Please check the [Contributing guidelines](https://github.com/goauthentik/authentik/blob/master/CONTRIBUTING.md#how-can-i-contribute).
+-->
+
+# Details
+* **Does this resolve an issue?**
+Resolves #
+
+## Changes
+### New Features
+* Adds feature which does x, y, and z.
+
+### Breaking Changes
+* Adds breaking change which causes \<issue\>.
+
+## Additional
+Any further notes or comments you want to make.