🎨 Palette: CLI Arguments & Accessibility Improvements

[EiJackGH]

• Added argparse support to allow configuring simulation parameters via CLI (days, initial-cash, initial-price, volatility).
• Introduced --quiet mode to suppress daily logs (only final results are shown).
• Introduced --no-color mode for accessibility.
• Added comprehensive tests in test_bitcoin_trading.py.
• Updated README.md with usage instructions.
• Updated .gitignore to exclude python cache files.

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PR created automatically by Jules for task 14297451448044310532 started by @EiJackGH

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