Create GitHub Issue Templates

To help contributors provide all the necessary information when opening issues, we should create standard templates for bug reports and feature requests.

**Acceptance Criteria**
A new .github/ISSUE_TEMPLATE directory is created. Inside, create two markdown files:
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- **bug_report.md**: This template should have sections for "Describe the bug," "Steps to Reproduce," "Expected Behaviour," "Screenshots," and "Environment (OS, Python version, etc.)."
- **feature_request.md**: This template should have sections for "Is your feature request related to a problem?" "Describe the solution you'd like," and "Describe alternatives you've considered."