Add issue templates (#60)

.github/ISSUE_TEMPLATE/1-request_an_example.md

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+---
+name: Request an example
+about: Suggest an example for the collection of examples
+title: ''
+labels: example
+assignees: ''
+
+---
+
+**Describe the example you'd like**
+A clear and concise description of what you want to have. The goal is to illustrate one feature in one example, so try to be as specific as possible.
+
+**Additional context (optional)**
+Here you can specify references (screenshots, links) of what you would like to see in the example.

.github/ISSUE_TEMPLATE/2-feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: feature request
+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 (optional)**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/3-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 (optional)**
+If applicable, add screenshots to help explain your problem.
+
+**Hardware (optional)**
+ - Device: [e.g. iPhone6]
+ - OS: [e.g. iOS]
+ - Browser [e.g. chrome, safari]
+ - Version [e.g. 22]
+
+**Additional context (optional)**
+Add any other context about the problem here.