Adding pull request template

.github/pull_request_template.md

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+<!-- 
+- Pull request title follows this format "SH NV-1234 Solves this problem":
+    - Initials of author
+    - associated Jira ticket number
+    - brief description
+- Choose appropriate labels
+- Use the "development" sidebar option to indicate if this closes any open issues, etc.
+-->
+# Description
+<!-- 
+In the body of the pull request, provide a description following the "What, Why, How" approach. 
+
+You could also add a gif using the "gifs for GitHub" Chrome extension: https://chrome.google.com/webstore/detail/gifs-for-github/dkgjnpbipbdaoaadbdhpiokaemhlphep/related?hl=en
+-->
+
+❓**What**:
+
+🧠**Why?**:
+
+👨‍💻**How?**:
+
+# Checklist:
+Have checked for the following:
+- [ ] The website still builds correctly, and you can view it using `mkdocs serve`.
+- [ ] There are no new "warnings" from mkdocs
+- [ ] Does your page follow the [page template](https://nhsdigital.github.io/rap-community-of-practice/example_RAP_CoP_page/) (or [here in Markdown](https://github.com/NHSDigital/rap-community-of-practice/blob/main/docs/example_RAP_CoP_page.md))? (**need to make a new one specific to NHSE Data Science**)
+- [ ] Spelling errors
+- [ ] Consistent capitalization
+- [ ] Consistent numbers
+- [ ] Material features incorrectly implemented: search for code blocks and markers (e.g. !!!).
+- [ ] Code snippets don't work
+- [ ] Images not working
+- [ ] Links not working
+
+## Where it was tested
+<!-- 
+Please describe the test configuration - below is an example.
+-->
+- Github Codespaces - 2-core, 4GB RAM, 32GB hard drive
+- devcontainer.json describes further settings