Create issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+
+Please note, this package is about IMPLEMENTATION of CommonMark https://commonmark.org/, not about markdown itself. We stay aside of markup discussions. Prior to report a bug, make sure it's about this package, not generic thing.
+
+**Before you post**
+
+1. https://spec.commonmark.org/ - make sure you've read CommonMark spec.
+2. https://spec.commonmark.org/dingus/ - if you think you found parse error, check it in reference implementation first.
+
+**In your report** 
+
+It will be very helpful, if you can provide permalinks with online samples and explain the difference:
+
+- https://markdown-it.github.io/ - online demo of `markdown-it`.
+- https://spec.commonmark.org/dingus/ - online demo of reference CommonMark's implementation.
+
+If you wish to provide code sample - make sure it is as small as possible and can be executed.
+
+-->

.github/ISSUE_TEMPLATE/development-question.md

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+---
+name: Development question
+about: ''
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+
+Note, we have some time constrains, but we always try to help developers, who write plugins. So:
+
+- Please, avoid generic programming questions.
+- Avoid questions about markdown. Use CommonMark resources for that https://commonmark.org/.
+- If you have issue with plugin - report it to plugin's repo/author.
+- Make sure you are familiar with dev docs https://github.com/markdown-it/markdown-it/tree/master/docs, and tried to do something.
+- Code samples are welcome.
+
+Also, you may find useful this links (may be someone already solved your problem):
+
+- https://github.com/markdown-it - list of "officially" provided plugins.
+- https://www.npmjs.com/search?q=keywords:markdown-it-plugin - community-written plugins.
+
+-->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+
+Please note, this package is highly extendable. Prior to request new feature, make sure it can not be implemented via plugins.
+
+You may also find useful this links:
+
+- https://github.com/markdown-it - list of "officially" provided plugins.
+- https://www.npmjs.com/search?q=keywords:markdown-it-plugin - community-written plugins.
+- https://github.com/markdown-it/markdown-it/tree/master/docs - docs for plugin developers.
+
+-->

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: For developpers
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+
+Note, we have some time constrains, but we always try to help developers, who write plugins. So:
+
+- Please, avoid generic programming questions.
+- Avoid questions about markdown. Use CommonMark resources for that https://commonmark.org/.
+- If you have issue with plugin - report it to plugin's repo/author.
+- Make sure you are familiar with dev docs https://github.com/markdown-it/markdown-it/tree/master/docs, and tried to do something.
+- Code samples are welcome.
+
+Also, you may find useful this links (may be someone already solved your problem):
+
+- https://github.com/markdown-it - list of "officially" provided plugins.
+- https://www.npmjs.com/search?q=keywords:markdown-it-plugin - community-written plugins.
+
+-->