Adds PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,11 @@
+Before creating your pull request, make sure that you have
+[signed the DOC](https://github.com/ory/ladon/blob/master/CONTRIBUTING.md#developers-certificate-of-origin). You can ammend your
+signature to the current commit using `git commit --amend -s`.
+
+Please create PRs only for bugs, or features that have been discussed with the maintainers, either at the
+[ORY Community](https://community.ory.am/) or join the [ORY Chat](https://gitter.im/ory-am/hydra).
+
+If you think you found a security vulnerability, please refrain from posting it publicly on the forums, the chat, or GitHub
+and send us an email to [hi@ory.am](mailto:hi@ory.am) instead.
+
+Please remove this template if you completed the steps from above.