Add issue and PR templates

Author: tshemsedinov

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+---
+
+**Describe the bug** A clear and concise description of what the bug is.
+
+**Expected alternatives** A clear and concise description of what you expected.
+
+**Screenshots** If applicable, add screenshots to help explain your problem.
+
+**Add references** If you have references to other books, articles, videos, or
+even posts somewhere please add URLs here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this book
+title: ''
+labels: feature
+assignees: ''
+---
+
+**Please describe your proposal.** A clear and concise description of what do
+you want to see in this book.
+
+**Describe alternatives you've considered** A clear and concise description of
+any alternative ideas you've considered.
+
+**Add references** If you have references to other books, articles, videos, or
+even posts somewhere please add URLs here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Please don't open an issue to ask questions
+---
+
+Issues on GitHub are intended to be related to problems and feature requests so
+we recommend not using this medium to ask them here grin. Thanks for
+understanding!
+
+If you have a question, please check out our support groups and channels for
+developers community or use `discussions` tab in this repo:
+
+- Discussions: https://github.com/HowProgrammingWorks/Book/discussions
+- Channel for HowProgrammingWorks community: https://t.me/HowProgrammingWorks
+- Channel for Metaeducation community: https://t.me/metaedu
+- Channel for Metarhia community: https://t.me/metarhia

.github/ISSUE_TEMPLATE/spelling.md

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+---
+name: Spelling
+about: Create a report to help us improve
+title: ''
+labels: spelling
+assignees: ''
+---
+
+**Describe the problem** How it was and how you think it should be.
+
+**Add link** Please add a URL to the file, certain place in this books or even
+to git blame (like this:
+https://github.com/HowProgrammingWorks/Book/blame/f47928a14c21d5ac2e2d218d10d10f330972929e/content/Abstract.en.md#L12-L17).
+
+**Screenshots** If applicable, add screenshots to help explain an issue.

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you for your pull request.
+Check following steps to help us land your changes:
+Change [ ] to [x] for completed items.
+-->
+
+- [ ] execute `npm run format` before open PR
+- [ ] update book index adding content
+- [ ] do not regenerate `book.pdf`, it is s subject of separate PR