Add issue templates

Author: rvlb

.github/ISSUE_TEMPLATE/bug_report.md

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+### Description
+
+Human readable description of the issue: **PLEASE-FILL-HERE**
+
+### Expected Behavior
+
+What's the expected behavior? **PLEASE-FILL-HERE**
+
+### Actual Behavior
+
+What's the seen behavior? Include stacktraces here. Remove sensitive info manually: **PLEASE-FILL-HERE**
+
+### Reproduction code
+
+Detailed steps to reproduce the bug, if possible with minimal runnable code.
+
+### Environment
+
+* Paste `python --version` output here: **PLEASE-FILL-HERE**
+* Paste `pip freeze` output here: **PLEASE-FILL-HERE**
+* Paste `nvidia-smi` output here: **PLEASE-FILL-HERE**
+* GPU used: **PLEASE-FILL-HERE**
+* Remove any sensitive info from the outputs above!

.github/ISSUE_TEMPLATE/new_feature.md

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+### Description
+
+Summarized description of the new feature or improvement: **PLEASE-FILL-HERE**
+
+### Implementation Strategy
+
+* Explain in detail how it would work.
+* Keep the scope as narrow as possible, to make it easier to implement.
+* Remember that this is a volunteer-driven project, and that contributions are welcome :)
+
+**PLEASE-FILL-HERE**
+
+### Expected Changes
+
+* Any API changes? **PLEASE-FILL-HERE**
+* Any Code Architecture changes? **PLEASE-FILL-HERE**
+* Any new Requirements?  **PLEASE-FILL-HERE**
+* Any Documentation changes? **PLEASE-FILL-HERE**
+
+### Test Cases
+
+Suggested test cases: **PLEASE-FILL-HERE**
+
+### Related Issues
+
+If any: **PLEASE-FILL-HERE**
+
+### References
+
+Any papers or existing code that can be helpful? **PLEASE-FILL-HERE**