docs(scully): add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+## PR Checklist
+Please check if your PR fulfills the following requirements:
+
+- [ ] The commit message follows our guidelines: https://github.com/scullyio/scully/blob/master/CONTRIBUTING.md#commit
+- [ ] Tests for the changes have been added (for bug fixes / features)
+- [ ] Docs have been added / updated (for bug fixes / features)
+
+
+## PR Type
+What kind of change does this PR introduce?
+
+<!-- Please check the one that applies to this PR using "x". -->
+
+- [ ] Bugfix
+- [ ] Feature
+- [ ] Code style update (formatting, local variables)
+- [ ] Refactoring (no functional changes, no api changes)
+- [ ] Other... Please describe:
+
+
+## What is the current behavior?
+<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->
+
+Issue Number: N/A
+
+
+## What is the new behavior?
+
+
+## Does this PR introduce a breaking change?
+
+- [ ] Yes
+- [ ] No
+
+
+<!-- If this PR contains a breaking change, please describe the impact and migration path for existing applications below. -->
+
+
+## Other information