Add Unit Tests and CI/CD Pipeline

[vamsi-op]

Description

The project currently has no automated tests or CI/CD. Add a comprehensive test suite and GitHub Actions workflow to ensure code quality.

What to Add

1. Unit Tests

• Test open_application() function
• Test time/date formatting
• Test command parsing in execute_command()
• Mock speech recognition and TTS for testing

2. GitHub Actions Workflow

• Run tests on pull requests
• Check Python code style (black, flake8)
• Test on multiple Python versions (3.8, 3.9, 3.10, 3.11)
• Add test coverage reporting

3. Testing Framework

• Use pytest for testing
• Use unittest.mock to mock speech/TTS
• Add pytest-cov for coverage reports

Files to Create

• tests/test_jarvis.py
• tests/test_commands.py
• .github/workflows/ci.yml
• Update requirements.txt with test dependencies

Benefits

• Catch bugs before they reach main
• Ensure PRs don't break existing functionality
• Improve code quality
• Build contributor confidence

Priority

High

[rexdivakar]

Hey @vamsi-op can u assign this to me?