Add GitHub issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Epsilon is not working like it should? Let us know!
+labels: 'bug'
+
+---
+#### Describe the bug
+A clear and concise description of what the bug is. Please describe a **single** bug per issue. Feel free to create multiple issues though!
+
+#### Screenshots
+Please provide at least one screenshot of the issue happening. This is by far the best way to quickly show any issue! To attach a screenshot, just go to our [online simulator](https://www.numworks.com/simulator), navigate to reproduce your issue, and click the "screenshot" button. Then drag'n'drop the file here!
+
+#### To Reproduce
+Steps to reproduce the behavior:
+1. Go to the '...' app
+2. Type '....'
+3. Scroll down to '....'
+4. See error
+
+#### Expected behavior
+A clear and concise description of what you expected to happen.
+
+#### Environment
+ - Epsilon version (Settings > About > Software version).
+ - The platform(s) on which the problem happens: online simulator, actual device, etc...

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for an improvement of Epsilon
+labels: 'enhancement'
+
+---
+#### Problem you'd like to fix
+Is your feature request related to a problem? Please provide a clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+Please describe a **single** improvement per issue. Feel free to open multiple issues though!
+
+#### Screenshots
+If possible, please attach a screenshot. You can go on our [online simulator](https://www.numworks.com/simulator), use the screenshot button, and drag'n'drop the file here.
+
+#### 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.
+
+#### Additional context
+Add any other context or screenshots about the feature request here.