Added templates for issues and pull requests

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve the application
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Important note**
+Please check other open and closed issues for a similar bug before reporting a new one. 
+
+**Behavior of the program**
+Please write a clear and concise description of what the bug is.
+
+**Expected behavior**
+Please describe clear and concise what you expected to happen.
+
+**To Reproduce**
+Please add all steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Screenshots**
+If applicable, please add screenshots to help explain your problem. Especially console logs from the development tools are very helpful.
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - OS Version: [e.g. 22]
+ - FreeTube version: [e.g. 0.8]
+
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/discussion.md

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+---
+name: Discussion
+about: Open up a new discussion about anything related to the project.
+title: ''
+labels: Discussion
+assignees: ''
+
+---
+
+**Important note**
+Please check other open and closed issues for a similar discussion or a question relating to your discussion before posting a new one. 
+
+**Topic**
+Please select what topic your discussion is about.
+- [ ] Coding
+- [ ] Contribution
+- [ ] Languages
+- [ ] Setup
+- [ ] Other. Please specify:
+
+**Discussion**
+Please write down whatever you want to discuss.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project which you would like to see in a future release
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Important note**
+Please check other open and closed issues for a similar feature request before proposing a new one. 
+
+**Is your feature request related to a usage problem (not a bug)? Please describe.**
+Please describe clear and concise of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like to see implemented**
+Please give a clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+Are there other ways to solve the problem? Please give a clear and concise description of any alternative solutions or features you might have considered.
+
+**Screenshots**
+Sometimes people have screenshots from mock-ups or other projects. Add them here.
+
+**Additional context**
+Add any other context about the feature request here.

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Ask a question which is not a bug or a feature request
+title: ''
+labels: question
+assignees: ''
+
+---
+
+**Important note**
+Please check other open and closed issues for a similar question before posting a new one. 
+
+**Topic**
+Please select what topic you are referring to.
+- [ ] Coding
+- [ ] Contribution
+- [ ] Languages
+- [ ] Setup
+- [ ] Other. Please specify:
+
+**Question**
+Please write down your question.

.github/PULL_REQUEST_TEMPLATE/bug_fix.md

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+---
+name: Bugfix
+about: Thanks for the submission of a bugfix
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Important note**
+Please note that only PrestoN is able to merge Pull Requests into master.
+
+**Related issue**
+Please link the issue your bugfix is referring to.
+
+**Description**
+Please write a clear and concise description of what the bugfix does.
+
+**Screenshots (if appropriate)**
+Please add before and after screenshots if there is a visible change.
+
+**Testing (for fixes that are not easily understandable)**
+Has this bugfix been tested?
+Please describe shortly how you tested it and whether there are any ramifications remaining. 
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - OS Version: [e.g. 22]
+ - FreeTube version: [e.g. 0.8]
+
+**Additional context**
+Add any other context about the problem here.

.github/PULL_REQUEST_TEMPLATE/feature_implementation.md

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+---
+name: Feature implementation
+about: Thanks for the implementation of a new feature 
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Important note**
+Please note that only PrestoN is able to merge Pull Requests into master.
+
+**Related issue**
+Please link the issue your feature is referring to.
+
+**Description**
+Please write a clear and concise description of what the implementation does.
+
+**Screenshots (if appropriate)**
+Please add before and after screenshots if there is a visible change.
+
+**Testing**
+Has this feature been tested?
+Please describe shortly how you tested it and whether there are any ramifications remaining. 
+
+**Desktop (please complete the following information):**
+ - OS: [e.g. iOS]
+ - OS Version: [e.g. 22]
+ - FreeTube version: [e.g. 0.8]
+
+**Additional context**
+Add any other context about the problem here.