[chores] Add templates for github issues

- Inspired from maskrcnn-benchmark

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: "\U0001F41B Bug Report"
+about: Submit a bug report to help us improve Pythia
+
+---
+
+## 🐛 Bug
+
+<!-- A clear and concise description of what the bug is. -->
+
+## Command
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+<!-- If you were running a command, post the exact command that you were running -->
+
+1.
+2.
+3.
+
+<!-- If you have a code sample, error messages, stack traces, please provide it here as well -->
+
+## Expected behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+## Environment
+
+Please copy and paste the output from the
+environment collection script from PyTorch
+(or fill out the checklist below manually).
+
+You can run the script with:
+```
+# For security purposes, please check the contents of collect_env.py before running it.
+python -m torch.utils.collect_env
+```
+
+ - PyTorch Version (e.g., 1.0):
+ - OS (e.g., Linux):
+ - How you installed PyTorch (`conda`, `pip`, source):
+ - Build command you used (if compiling from source):
+ - Python version:
+ - CUDA/cuDNN version:
+ - GPU models and configuration:
+ - 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: "\U0001F680Feature Request"
+about: Submit a proposal/request for a new Pythia feature
+
+---
+
+## 🚀 Feature
+<!-- A clear and concise description of the feature proposal -->
+
+## Motivation
+
+<!-- Please outline the motivation for the proposal. Is your feature request related to a problem? e.g., I'm always frustrated when [...]. If this is related to another GitHub issue, please link here too -->
+
+## Pitch
+
+<!-- A clear and concise description of what you want to happen. -->
+
+## Alternatives
+
+<!-- A clear and concise description of any alternative solutions or features you've considered, if any. -->
+
+## Additional context
+
+<!-- Add any other context or screenshots about the feature request here. -->

.github/ISSUE_TEMPLATE/questions-help-support.md

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+---
+name: "❓Questions/Help/Support"
+about: Do you need support?
+
+---
+
+## ❓ Questions and Help