Build Commit Heatmap (Static)

[saurabhKS14]

Implement a static commit heatmap that visualizes commits over time. Start by representing commit frequency on a weekly or monthly scale using simple text characters (e.g., ▓, ░, etc.).

Tasks:

• Parse the commit history and group commits by week or month.
• Implement a simple heatmap using text characters to represent commit density (e.g., ▓ for high commits, ░ for low).
• Display the heatmap in the CLI for a given month or week.
• Commit the heatmap implementation.