Added pull request template

Author: jeppekroghitk

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,19 @@
+<?php
+#### Link to ticket
+
+Please add a link to the ticket being addressed by this change.
+
+#### Description
+
+Please include a short description of the suggested change and the reasoning behind the approach you have chosen.
+
+#### Screenshot of the result
+
+If your change affects the user interface you should include a screenshot of the result with the pull request.
+
+#### Checklist
+
+- [ ] My code is covered by test cases.
+- [ ] My code passes our test (all our tests).
+- [ ] My code passes our static analysis suite.
+- [ ] My code passes our continuous integration process.