[Misc] Add pull request/issue templates (uber#378)

This PR adds templates for issues and pull requests

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: "Bug report"
+about: "Create a bug report to help us improve Neuropod"
+
+---
+
+## Bug
+
+<!-- A clear and concise description of what the bug is. -->
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1.
+1.
+1.
+
+<!-- If you have code samples, error messages, or stack traces, please provide them here as well -->
+
+## Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Environment
+
+ - Neuropod Version (e.g., 0.2.0):
+ - OS (Linux, macOS):
+ - Language (Python, C++, Go bindings):
+ - Python version: 
+ - Using OPE: yes/no
+
+If this bug report is about running a specific model:
+
+ - Neuropod backend (e.g. TensorFlow, PyTorch, Keras, TorchScript, Python): 
+ - Framework version (e.g. 1.3.0):
+
+If running on GPU:
+
+ - CUDA/cuDNN version:
+ - The output of `nvidia-smi`:
+ ```
+ 
+ ```
+
+ - Any other relevant information:
+
+## Additional context
+
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: "Feature request"
+about: "Submit a request for a new Neuropod feature"
+
+---
+
+## Feature
+<!-- A clear and concise description of the feature request/proposal -->
+
+## 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 [...]. Link any relevant issues here -->
+
+## 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, if any. -->
+
+## Additional context
+
+<!-- Add any other context about the feature request here. -->

.github/pull_request_template.md

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+### Summary:
+
+
+### Test Plan:
+