misc: Add templates for GitHub issues

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug or incorrect behavior
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Execute command '...'
+2. Start upload '....'
+3. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Setup details**
+Please provide following details, if applicable to your situation:
+- Operating System: [e.g. Linux, Windows, macOS]
+- Used tusd version: [can be obtained by running `tusd -version`]
+- Used tusd data storage: [e.g. disk store, AWS S3, Google Cloud Storage]
+- Used tusd configuration: [what arguments are you using to invoke `tusd`?]
+- Used tus client library: [e.g. tus-js-client, tus-java-client, TUSKit, Uppy.js]

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea or improvement
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Can you provide help with implementing this feature?**
+The tus team is always happy to improve your situation but our time is also sadly limited, so it may take some time until we can work on your request. If you have the resources and knowledge to take a shot at your idea, we are more than eager to assist you.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a general question about using tusd
+title: ''
+labels: question
+assignees: ''
+
+---
+
+**Question**
+Please place your question here.
+
+**Setup details**
+Please provide following details, if applicable to your situation:
+- Operating System: [e.g. Linux, Windows, macOS]
+- Used tusd version: [can be obtained by running `tusd -version`]
+- Used tusd data storage: [e.g. disk store, AWS S3, Google Cloud Storage]
+- Used tusd configuration: [what arguments are you using to invoke `tusd`?]
+- Used tus client library: [e.g. tus-js-client, tus-java-client, TUSKit, Uppy.js]