Adding checklists for the issue tracker

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Report a bug in the tobac library
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+* [ ] Have you searched the issue tracker for the same problem?
+* [ ] Have you checked if you're using the latest version? If not, which version are you using?
+* [ ] Have you mentioned the steps to reproduce the issue?
+* [ ] Have you, if applicable, included error messages?

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: 'Ask a general question about tobac '
+title: ''
+labels: question
+assignees: ''
+
+---
+
+* [ ] Have you searched the issue tracker for similar questions?
+* [ ] Have you read the documentation to ensure your question isn't already answered?
+* [ ] Have you searched Stack Overflow or other relevant forums to see if your question has been answered elsewhere?

.github/ISSUE_TEMPLATE/release.md

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+---
+name: Release
+about: Prepare a new release for tobac
+title: Release v.X.Y.Z
+labels: release
+assignees: ''
+
+---
+
+Checklist for releasing vX.Y.Z:
+
+* [ ]  Re-run notebooks and commit updates to repository
+* [ ]  Bump version in `__init__.py` in `RC_vX.Y.Z`
+* [ ]  Add changelog in `RC_vX.Y.Z`
+* [ ]  Add new contributors to vX.Y.Z
+* [ ]  Merge `RC_vX.Y.Z` into `main`
+* [ ]  Delete `RC_vX.Y.Z` branch
+* [ ]  Create release
+* [ ]  Push release to conda-forge
+* [ ]  E-mail tobac mailing list