Docs: Add a pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+### Description, Motivation & Context
+
+<!-- Describe your changes in detail. -->
+
+### Related issues
+
+<!-- Please link any related issues here. -->
+
+### Checklist
+
+<!-- Go over all the following points, and put an `x` in all the boxes that apply. -->
+
+- [ ] All links that make it easy to review this PR are in the description (esp. Wiki).
+- [ ] My preset/field has a good icon.
+- [ ] My preset works well with other presets when searching for it in the iD preview. <!-- Eg. no similar presents that cause confusion. -->
+- [ ] I Check the info `(i)` image and text and both help understand the preset.
+- [ ] There is a Wikidata entry on the OSM Wiki for the core tag of my preset.
+
+### Testing help…
+
+<!-- After you submit your PR, wait for the Preview to generate, then update this section -->
+
+**Preview link to map objects that show this preset in action:**
+
+**Screenshot of the map and preset sidebar:**
+
+**Overpass turbo query to find OSM objects that fit this preset:**
+
+<!-- https://overpass-turbo.eu/ -->