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

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug. Do not report security concerns this way.
+title: ''
+labels: bug
+assignees: ''
+---
+
+<!-- Please do not talk about security concerns here. Go to https://hackerone.com/github to report security concerns. -->
+
+## Describe the bug
+
+## Steps to reproduce the bug
+
+## Describe the expected behavior
+
+## Further context
+
+<!-- If helpful please provide screenshots, logs, links to other related issues. -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Security concerns
+    url: https://hackerone.com/github
+    about: Report security concerns on HackerOne.
+  - name: Questions about writing workflow or action files?
+    url: https://github.community/c/code-to-cloud/github-actions
+    about: Visit the GitHub Community Forum's Actions Board.
+  - name: Issue or question about GitHub Actions
+    url: https://help.github.com/en/articles/about-github-actions#contacting-support
+    about: If you are having an issue or question about GitHub Actions then please contact customer support

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+<!-- Please do not talk about security concerns here. Go to https://hackerone.com/github to report security concerns. -->
+
+## 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/pull_request_template.md

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+## Changes
+
+<!-- List the change(s) you're making with this PR. -->
+
+## 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 -->