chore: add issue and pr templates (#73)

.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: ''
+
+---
+
+## Describe the bug
+A clear and concise description of what the bug is.
+
+## How to Reproduce
+Steps to reproduce the behavior, as minimal as possible.
+
+## Expected behavior
+Description of what you expected to happen.
+
+## Actual behavior
+Description of what actually happens. If needed may contain logs/outputs.
+
+## Environment:**
+ - OS: [e.g. OSX, Windows]
+ - Python version [e.g. 3.7.11]
+
+## 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? If so, please describe it.
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## How you envision the solution
+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 have considered.
+
+## Additional context
+Add any other context or screenshots about the feature request here.

.github/pull_request_template.md

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+## Description
+
+Include description of feature this PR introduces or a bug that it fixes. Include the following information:
+
+- Context: why is it needed? In case of bug, what was the cause for the bug?
+- Concise description of the implemented solution.
+- If any dependencies are added, list them and justify why they are needed.
+
+## Please verify that you have completed the following steps
+
+- [ ] I have self-reviewed my code.
+- [ ] I have included test cases validating introduced feature/fix.
+- [ ] I have updated documentation.