Add .github/ISSUE_TEMPLATE

Author: Alison Wu

.github/ISSUE_TEMPLATE/bug_feature.md

@@ -0,0 +1,16 @@
+---
+name: Bug Report or Feature Request
+about: Report a bug or suggest a new feature!
+title: ""
+labels: ""
+assignees: ""
+---
+
+### Problem
+
+<!--
+For a bug report, please copy and paste any error messages from the application or command-line here.
+For a feature request, please state how the new functionality could benefit the community.
+-->
+
+### Proposed solution

.github/ISSUE_TEMPLATE/release_checklist.md

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+---
+name: Release
+about: Checklist and communication channel for PyPI and GitHub release
+title: "Ready for <version-number> PyPI/GitHub release"
+labels: "release"
+assignees: ""
+---
+
+### Release checklist for GitHub contributors
+
+- [ ] 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 and
+  tested
+- [ ] Successfully run any tutorial examples or do functional testing in some other way.
+- [ ] Grammar and writing quality have been checked (no typos).
+
+Please mention @sbillinge when you are ready for release. Include any additional comments necessary, such as
+version information and details about the pre-release.