Add issue templates for easier project handling

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+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/development-issue-template.md

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+---
+name: Development Issue Template
+about: This is a developing issue template to be used by the developers
+title: Dev
+labels: ''
+assignees: ''
+
+---
+
+Provide a general summary of the issue in the Title above
+
+**Summary**
+A brief summary of the task or feature. 
+
+**Description**
+A more detailed description of the task or feature.
+
+**Acceptance Criteria**
+Which criteria has to be reached to be accepted
+- [ ] Criterion 1
+- [ ] Criterion 2
+- [ ] ...
+
+**Tasks**
+Which tasks are included to add this feature
+- [ ] Task 1
+- [ ] Task 2
+- [ ] ...
+
+**Dependencies**
+Which dependencies are introduced to the project
+- [ ] Dependency 1
+- [ ] Dependency 2
+- [ ] ...
+
+**Estimates**
+Estimated effort for completion: [Effort in hours/days/weeks]
+
+**Additional Information**
+Any additional information relevant to the development.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+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.