Create Expense-Tracker-App.md

Added Expense Tracker App project idea

Projects/1-Beginner/Expense-Tracker-App.md

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+# Expense Tracker App
+
+A simple web application to track daily expenses and manage personal finances.
+
+## User Stories
+- [ ] User can add new expenses with description, amount, and category
+- [ ] User can view all expenses in a list with total amount
+- [ ] User can delete expenses from the list
+- [ ] User can filter expenses by category
+
+## Bonus Features
+- [ ] User can edit existing expenses
+- [ ] User can see spending statistics with charts
+- [ ] Data persists using localStorage
+- [ ] User can export expenses to CSV
+
+## Technologies
+- HTML, CSS, JavaScript
+- Local Storage for data persistence
+- Chart.js for statistics (optional)
+
+## Implementation Tips
+- Start with basic CRUD operations
+- Use arrays and objects to manage expense data
+- Implement localStorage for data persistence
+- Add input validation for amount fields
+
+## Learning Outcomes
+- DOM manipulation
+- Array methods (filter, map, reduce)
+- Local Storage API
+- Event handling