feat: Adding Expense Tracker (Issue #141)

[Master-Keshav]

Fix to Issue #141

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Features: 1) Expense tracking: Users can add, view, and categorize their expenses. 2) Categories: Expenses can be categorized into different types (e.g., groceries, entertainment, bills). 3) Expense insights: Provide statistics and insights into spending patterns, such as total spending per category, monthly expenses, and average daily spending. 4) Persistence: Allow users to save their expense data to a file for future reference. 5) User-friendly command-line interface or a simple GUI.

Checklist

• [X] I read the contributing guidelines
• [X] I structured my project as stated in the contributing guidelines
• [X] My project uses dependencies
• [X] I starred the repo
• [X] I had fun contributing!

[theadeyemiolayinka]

Project reviewed and merged. Thank you @Master-Keshav Feel free to add more projects.