Update issue templates (#4)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**Which parts of the speaker are affected**
+Describe which part of the speaker that is at fault; i.e. the cabinet, the PCB design or the software platform
+
+**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 or picture 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/ISSUE_TEMPLATE/implementation-task.md

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+---
+name: Implementation task
+about: Tasks with a clear and defined scope that is ready to implement (not a feature
+  request)
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+### Description
+
+**Add a detailed description of the scope of this task**
+
+### Definition of Done
+1. list
+2. all
+3. items
+
+#### Documentation
+Which part of the documentation needs to be updated or extended?

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question
+title: ''
+labels: question
+assignees: ''
+
+---
+
+### Questions
+Ask a questions for which you can't find the answer to in the documentation: [https://stroem.readthedocs.io](https://stroem.readthedocs.io)