chore: create bug/feature/PR template, configure template chooser

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+## Describe your idea
+
+## What problem does your idea solve?
+
+## Are there alternative ways to do the same thing?
+
+## Further context
+
+<!-- If helpful please provide screenshots, logs, links to other related issues. -->
+
+## Do you want to help out to implement your idea?

.github/ISSUE_TEMPLATE/problem_report.md

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+---
+name: Problem report
+about: Report problems with using the stale action.
+title: ''
+labels: bug
+assignees: ''
+---
+
+- [ ] I've read the [debugging](https://github.com/actions/stale#debugging) section of the readme.
+
+## Describe your problem
+
+## Steps to reproduce the problem
+
+## Provide your stale action configuration
+
+## Further context
+
+<!-- If helpful please provide screenshots, logs, links to other related issues. -->

.github/pull_request_template.md

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+<!-- List the change(s) you're making with this PR. -->
+**Changes:**
+- [x] ...
+
+**Context**
+
+<!-- Explain why you're making the change(s). If you're closing an issue with this PR use the Closes keyword and the issue number like this: Closes #123 -->