Create Community ODP Notebook (#73)

[AoufNihed]

Resolves #73

Added a new community notebook that includes:

• Solar generation pattern simulation
• Synthetic weather feature generation
• Time-based feature engineering
• Data visualization and analysis
• Model evaluation techniques

Key features:

• Realistic daily solar patterns using sine waves
• Weather features (temperature, cloud cover, radiation)
• Time-based features (hour, is_daytime)
• Statistical analysis and visualizations

[AoufNihed]

@peterdudfield Hi! I've created a new community notebook for this issue. The notebook includes:

• Solar generation pattern simulation with daily cycles
• Weather feature generation (temperature, cloud cover, radiation)
• Time-based feature engineering
• Data visualization
• Basic statistics and model evaluation

Could you please review my work and provide feedback? Thanks!