Provide issue 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: temanbrcom
+
+---
+
+## Description ##
+A clear and concise description of what the bug is.
+
+## Steps 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 9, Windows 8.1]
+ - IDE: [e.g. VS Code, Che 7, Theia IDE] 
+
+## Additional information ##
+Add any other information 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: new feature
+assignees: ''
+
+---
+
+**Is your feature request related to a problem?**
+Provide a clear and concise description of what the problem is, e.g. 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 information**
+Add any other information or screenshots related to the feature request here.

.github/ISSUE_TEMPLATE/internal-changes.md

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+---
+name: Internal changes
+about: Create an issue to track code improvement
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Description ##
+As a USER, I would like to... so I can...
+
+## Acceptance Criteria ##
+- The feature works as designed.
+- The code is tested.
+- There are no bugs or code smells.
+- The solution is tested on all platforms.
+- The changelog is updated.
+
+## Definition of Done ##
+- The story is implemented according to the description.
+- Unit testing done (Preferably by TDD approach, coverage should be at least 70%).
+- Code review done by at least one other team member.
+- Manual testing is done.
+- Documentation is added and reviewed (if needed).
+- The pull request is approved.
+- The story is merged into the development branch.
+- Tests are performed on the development branch.
+
+## Technical details ##
+This is the place for any implementation-related notes