Add a pull request template

Author: j-f1

PULL_REQUEST_TEMPLATE.md

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+If you’re adding a new scraper, please ensure that you have:
+
+- [ ] Tested the scraper on a local copy of DevDocs
+- [ ] Ensured that the docs are styled similarly to other docs on DevDocs
+- [ ] Added these files to the <code>public/icons/*your_scraper_name*/</code> directory:
+  - [ ] `16.png`: a 16×16 pixel icon for the doc
+  - [ ] `[email protected]`: a 32×32 pixel icon for the doc
+  - [ ] `SOURCE`: A text file containing the URL to the page the image can be found on or the URL of the original image itself
+
+<!-- Replace the `[ ]` with a `[x]` once you’ve completed each step. -->