GitHub: add basic issue templates

.github/ISSUE_TEMPLATE/10-bug-report.md

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+---
+name: Bug report
+about: Use this template for reporting a bug related to building the documentation.
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Platform
+<!-- Name and version of OS -->
+
+# Issue
+
+## Failure
+
+## Steps to reproduce
+<!-- A description of how to trigger this bug. -->
+
+## Configuration
+
+## Input and output logs (if possible)

.github/ISSUE_TEMPLATE/20-documentation-issue.md

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+---
+name: Documentation issue
+about: Use this template for reporting an issue in the documentation.
+title: ''
+labels: 'documentation'
+assignees: ''
+
+---
+
+## Incorrect section
+<!-- Which section of the documentation is wrong? Please include a link to it, if that is possible. -->
+
+## Description of the problem
+<!-- Which statements of the documentation are inaccurate? -->
+
+## Proposed solution
+<!-- What do you think the correction should be? -->

.github/ISSUE_TEMPLATE/30-feature-request.md

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+---
+name: Feature request
+about: Use this template for raising a feature request.
+title: ''
+labels: 'enhancement'
+assignees: ''
+
+---
+
+## Description of the problem
+<!-- Is your feature request related to a problem? Please describe. Ex. I'm always frustrated when [...] -->
+
+## Proposed solution
+<!-- Describe the solution you'd like. -->
+
+## Alternatives
+<!-- Describe any alternative solutions or features you've considered. -->
+
+## Additional context
+<!-- Add any other context or screenshots about the feature request here. -->