Add GitHub templates

.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**
+Steps to reproduce the behavior:
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Desktop (please complete the following information):**
+
+- OS: [e.g. iOS]
+- Browser [e.g. chrome, safari]
+- Version [e.g. 22]
+
+**Smartphone (please complete the following information):**
+
+- Device: [e.g. iPhone6]
+- OS: [e.g. iOS8.1]
+- Browser [e.g. stock browser, safari]
+- Version [e.g. 22]
+
+**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.
+
+**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.

.github/pull_request_template.md

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+<!--
+
+Please use the content below as a template for your pull request.
+Feel free to remove sections which do not make sense.
+
+-->
+
+## Scope
+
+<!-- Brief description of WHAT you’re doing and WHY. -->
+
+Closes #issue_number
+
+## Implementation
+
+<!--
+
+Some description of HOW you achieved it. Perhaps give a high level description of the program flow. Did you need to refactor something? What tradeoffs did you take? Are there things in here which you’d particularly like people to pay close attention to?
+
+-->
+
+## Screenshots
+
+|         | before | after |
+| ------- | ------ | ----- |
+| desktop |        |       |
+| mobile  |        |       |
+
+## How to Test
+
+<!--
+
+A straightforward scenario of how to test your changes could help colleagues that are not familiar with the part of the code that you are changing but want to see it in action. This section can include a description or step-by-step instructions of how to get to the state of v2 that your change affects.
+
+A "How To Test" section can look something like this:
+
+- Sign in with a user with tracks
+- Activate `show_awesome_cat_gifs` feature (add `?feature.show_awesome_cat_gifs=1` to your URL)
+- You should see a GIF with cats dancing
+
+-->