chore: create issue templates

Create 3 issue templates to make it easier to triage incoming issues into bug reports, feature requests, or questions.

.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.
+
+**To Reproduce**
+Your bug has a higher chance of being fixed if it can be reproduced by others. Therefore, it's very good to try to create a minimum setup that displays the erroneous behaviour (e.g. test RTP stream, create a failing unit test, etc...)
+
+Steps to reproduce the behavior:
+1. Set up '...'
+2. Do this '...'
+3. See error
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - OS: [e.g. Windows, Linux, iOS]
+ - Browser [e.g. Chrome, Firefox, Safari] or Node.js + version
+ - Version [e.g. 6.0.1]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project.
+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.
+
+**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 technical question related to this project.
+title: ''
+labels: question
+assignees: ''
+
+---
+
+Tell us what's on your mind.