feat: Add macOS support with installation script

[YoungPhlo]

Relates to:

Resolves #1

Risks

Low - Changes are additive and don't modify existing functionality

• Only affects macOS installation process
• No changes to core application code

Background

What does this PR do?

• Adds macOS installation support via install.sh script
• Updates README with macOS-specific installation instructions
• Adds .gitignore file to exclude embeddings cache and virtual environment

What kind of change is this?

Features (non-breaking change which adds functionality)

• Adds macOS installation support while maintaining existing Windows functionality

Documentation changes needed?

Documentation has been updated in this PR:

• Added macOS installation instructions to README.md
• Added section specifically for Mac users with step-by-step guide

Testing

Where should a reviewer start?

1. Review install.sh script
2. Review updated README.md macOS instructions

Detailed testing steps

On a macOS system:

1. Install Python 3.10 via homebrew
2. Clone the repository
3. Run chmod +x install.sh
4. Execute ./install.sh
5. Verify the application launches and opens in browser
6. Test that the sample browser functions correctly

Deploy Notes

New files added:

• install.sh - Installation script for macOS
• .gitignore - Standard Python gitignore with custom additions

The install.sh script:

• Creates a Python virtual environment
• Installs required dependencies
• Sets up PyTorch with MPS support for Apple Silicon
• Creates and configures run.sh for easy launching