Create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+**Describe your changes**
+A clear and concise description of what changes are made by this pull request.
+
+**Type of update**
+Is this a:
+* Workflow update
+* Update to documentation (markdown/code comments)
+* Work in progress
+
+**Associated issues**
+Reference associated issue numbers. Does this pull request close any issues?
+
+**Additional context**
+Add any other context here.
+
+**For the reviewer**
+- [ ] Assign yourself a reviewer
+- [ ] Test passes (if no test run, enable `.github/workflows/ci-tests.yml`)
+- [ ] Changes reviewed
+- [ ] Workflow/Documentation updates made to both `index.ipynb` and `index-Colab.ipynb`
+- [ ] PR approved
+- [ ] Merge PR 
+- [ ] Binder environment built*
+- [ ] If PR author is a new contributor, add to plantcv with a comment like [this](https://github.com/danforthcenter/plantcv/pull/1737#issuecomment-3084551747)
+
+\* To build a binder environment after changes are pushed are merged into main, click on the [launch binder] button in the README.md. A repository usually takes a long time to launch after updates because Binder needs to create the environment. This step aims to provide quicker launches to users.