Feature: add template for new dataset PRs

.github/PULL_REQUEST_TEMPLATE/new-data.md

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+<!---
+Provide a short summary in the Title above. Examples of good PR titles:
+* "New data request: add deaths in police custody datasets"
+-->
+
+# Goal & possible research questions
+<!---
+Describe your changes, and why you're making them. Is this linked to an open
+issue, a Trello card, or another pull request? Link it here.
+
+ * Goal: what you want to do with this dataset, e.g. "Look at patterns in deaths following police custody"
+ * Research questions: what kinds of questions you might want to answer with this if you know, e.g. "Find out corrolation between race and deaths in police custody". This isn't essential but helps us plan what we call things and where we put them, especially if you plan to use this in conjunction with other datasets.
+ * Suggested path: what do you think this set should be called? E.g. 'deaths-following-police-contact'.
+-->
+
+ * Goal:
+ * Research question(s):
+ * Suggested path:
+
+# Newly introduced dataset(s):
+<!---
+Describe any new datasets being added, detailing the formats, sources and licenses (if you know). If you are adding more than one dataset, let us know if they should be added in separate places or combined together.
+
+Example:
+
+ * License: None stated, presume OGL?
+ * URL: https://policeconduct.gov.uk/research-and-learning/statistics/annual-deaths-during-or-following-police-contact-statistics
+ * File format: ODS
+-->
+
+ * License:
+ * URL:
+ * File format:
+
+# Impact on existing dataset(s):
+<!---
+Include this section if you are changing or adding to any existing datasets.
+Link any related pull requests elsewhere, or instructions for merge (e.g. what else needs
+updating along with this change)
+-->
+
+# To-do before merge
+<!---
+(Optional -- remove this section if not needed)
+Include any notes about things that need to happen before this PR is merged, e.g.:
+- [ ] Update Observable documents
+- [ ] Confirm license
+- [ ] Ensure PR #56 is merged
+-->
+
+# Checklist:
+<!---
+This checklist is mostly useful as a reminder of small things that can easily be
+forgotten – it is meant as a helpful tool rather than hoops to jump through.
+Put an `x` in all the items that apply, make notes next to any that haven't been
+addressed, and remove any items that are not relevant to this PR.
+-->
+
+- [ ] README files have been created and updated (including listings)
+- [ ] We have a license to use any new datasets being added
+- [ ] CI tests have passed
+- [ ] Great Expectations tests have been added
+- [ ] There are unit tests added where appropriate
+- [ ] Any scripts are reproducible - returning the same results each run