[Github] Add pull request template

Closes #97

.github/pull_request_template.md

@@ -0,0 +1,15 @@
+| Question           | Answer
+| ------------------ | ------------------
+| **JIRA issue**     | [EZP-XXXXX](https://jira.ez.no/browse/EZP-XXXXX)
+| **Type**           | Bug/Improvement/Feature/Misc
+| **Target version** | latest stable `1.8` for bug fixes, `master` for new features
+| **BC breaks**      | yes/no
+| **Doc needed**     | yes/no
+
+<!-- Replace this comment with Pull Request description -->
+
+**TODO**:
+- [ ] Implement feature / fix a bug.
+- [ ] Implement tests + specs and passing (`$ composer test`)
+- [ ] Fix new code according to Coding Standards (`$ composer fix-cs`).
+- [ ] Ask for Code Review.