Add issue and pull request templates for better contribution guidelines

Author: sng-asyncfunc

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Something isn't working
+labels: bug
+---
+
+## What happened?
+
+<!-- Clear description of the bug -->
+
+## Steps to reproduce
+
+1.
+2.
+3.
+
+## Expected behavior
+
+<!-- What should have happened -->
+
+## Environment
+
+- OS:
+- Python:
+- Node:
+
+## Logs/Screenshots
+
+<!-- If applicable -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest an idea
+labels: enhancement
+---
+
+## Problem
+
+<!-- What problem does this solve? -->
+
+## Proposed solution
+
+<!-- How should it work? -->
+
+## Alternatives considered
+
+<!-- Other approaches you've thought about -->

.github/pull_request_template.md

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+## What
+
+<!-- Brief description of changes -->
+
+## Why
+
+<!-- Motivation / issue link -->
+
+## How
+
+<!-- Implementation approach -->
+
+## Testing
+
+- [ ] Tests added/updated
+- [ ] Manual testing done
+
+## Checklist
+
+- [ ] Code follows project style
+- [ ] Self-reviewed
+- [ ] No breaking changes (or documented)