Add PR template

.github/pull_request_template.md

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+**Description**
+
+<!--
+
+A clear and concise description of what you changed and why.
+
+Bullet points can be enough.
+
+You can use the following PRs as inspiration:
+  - https://github.com/stackernews/stacker.news/pull/227 (feature)
+  - https://github.com/stackernews/stacker.news/pull/915 (feature)
+  - https://github.com/stackernews/stacker.news/pull/871 (fix)
+  - <your PR could be here>
+
+Don't forget to mention which tickets this closes (if any).
+Use following syntax to close them automatically on merge: closes #<NUMBER>
+
+-->
+
+**Screenshots**
+
+<!--
+
+If your changes are user facing, please add screenshots of the new UI.
+
+You can also create a video to showcase your changes (useful to show UX).
+
+-->
+
+**Additional Context**
+
+<!--
+
+You can mention here anything that you think is relevant for this PR. Some examples:
+
+* You encountered something that you didn't understand while working on this PR
+* You were not sure about something you did but did not find a better way
+* You initially had a different approach but went with a different approach for some reason
+
+-->
+
+**Checklist**
+
+<!-- Examples for backwards incompatible changes:
+- dropping database columns
+- changing GraphQL type definitions to make a field mandatory -->
+- [ ] Are your changes backwards compatible?
+
+<!-- If your PR is not ready for review yet, please mark your PR as a draft.
+If changes were requested, request a new review when you incorporated the feedback. -->
+- [ ] Did you QA this? Could we deploy this straight to production?
+
+<!-- You should be able to use the mobile browser emulator in your browser to test this. -->
+- [ ] For frontend changes: Tested on mobile?