Add conda-forge release chceklist to GitHub Issue template

Author: bobleesj

.github/ISSUE_TEMPLATE

@@ -0,0 +1,35 @@
+---
+name: Release
+about: Checklist and communication channel for PyPI and GitHub release
+title: "Ready for <version-number> PyPI/GitHub release"
+labels: "release"
+assignees: ""
+---
+
+### PyPI/GitHub release checklist:
+
+- [ ] All PRs/issues attached to the release are merged.
+- [ ] All the badges on the README are passing.
+- [ ] License information is verified as correct. If you are unsure, please comment below.
+- [ ] Locally rendered documentation contains all appropriate pages, including API references (check no modules are
+  missing), tutorials, and other human written text is up-to-date with any changes in the code.
+- [ ] Installation instructions in the README, documentation and on the website (e.g., diffpy.org) are updated.
+- [ ] Successfully run any tutorial examples or do functional testing with the latest Python version.
+- [ ] Grammar and writing quality are checked (no typos).
+
+Please mention @sbillinge here when you are ready for PyPI/GitHub release. Include any additional comments necessary, such as
+version information and details about the pre-release here:
+
+### conda-forge release checklist:
+
+<!-- After @sbillinge releases the PyPI package, please check the following when creating a PR for conda-forge release.-->
+
+- [ ] New package dependencies listed in `conda.txt` and `test.txt` are added to `meta.yaml` in the feedstock.
+- [ ] All relevant issues in the feedstock are addressed in the release PR.
+
+### Post-release checklist
+
+<!-- Before closing this issue, please complete the following: -->
+
+- [ ]  Run tutorial examples and conduct functional testing using the installation guide in the README. Attach screenshots/results as comments.
+- [ ]  Documentation (README, tutorials, API references, and websites) is deployed without broken links or missing figures.