Create pull request template

Author: Patricia Gonzalez

.github/pull_request_template.md

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+This is a:
+
+<!-- Tick one category - if more than one applies, it should be split up -->
+
+- [ ] ✨ **New feature** - new behaviour has been implemented
+- [ ] 🐛 **Bug fix** - existing behaviour has been made to behave
+- [ ] ♻️ **Refactor** - the behaviour has not changed, just the implementation
+- [ ] ✅ **Test backfill** - tests for existing behaviour were added but the behaviour itself hasn't changed
+- [ ] ⚙️ **Chore** - maintenance task, behaviour and implementation haven't changed
+
+<!-- adapted from https://gitmoji.dev/ -->
+
+### Description
+
+<!-- Describe what merging this pull request will do -->
+
+- **Purpose** - <!-- Allow astronauts to perform a case-insensitive search for their spaceship. -->
+
+<!-- Describe how the reviewer should check it works -->
+
+- **How to check** - <!-- Log in as an astronaut, go to the Spaceships tab and type "saturn" into the search box. Previously Saturn V would not have appeared, due to the capital S, but now it does. -->
+
+### Links
+
+<!-- links to other issues/PRs/tickets, e.g. user/repo#123 -->
+
+### Author checklist
+
+<!-- All PRs -->
+
+- [ ] I have written a title that reflects the relevant ticket
+- [ ] I have written a description that says what the PR does and how to validate it
+- [ ] I have linked to the project board ticket (and any related PRs/issues) in the Links section
+- [ ] I have added a link to this PR to the ticket
+- [ ] I have made the PR to `staging` from a branch named `<category>/<name>`, e.g. `feature/edit-spaceships` or `bugfix/restore-oxygen`
+- [ ] I have completed the manual tests [described here](https://github.com/CodeYourFuture/tech-team/wiki/Manual-Test-Procedures)
+- [ ] I have requested reviewers here and in my team chat channel
+<!-- depending on the task, the following may be optional -->
+- [ ] I have spoken with my PM or TL about any parts of this task that may have become out-of-scope, or any additional improvements that I now realise may benefit my project
+- [ ] I have added tests, or new tests were not required
+- [ ] I have updated any documentation (e.g. diagrams, schemas), or documentation updates were not required