Create Currency-Converter-App.md

Added Currency Converter App project idea

Projects/1-Beginner/Currency-Converter-App.md

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+# Currency Converter App
+
+A web application that converts between different currencies using real-time exchange rates.
+
+## Objective
+Build an application that can convert amounts between different currencies with up-to-date exchange rates.
+
+## User Stories
+- [ ] User can see a dropdown list of available currencies
+- [ ] User can select a source currency and target currency
+- [ ] User can enter an amount to convert
+- [ ] User can see the converted amount in real-time
+- [ ] User can see the current exchange rate
+- [ ] User can swap source and target currencies with a button
+
+## Bonus Features
+- [ ] User can see a history of exchange rates
+- [ ] User can favorite frequently used currencies
+- [ ] User can see currency flags alongside names
+- [ ] User can convert to multiple currencies at once
+- [ ] Application works offline with cached rates
+
+## Technologies
+- HTML, CSS, JavaScript
+- Free Currency API: [exchangerate-api.com](https://www.exchangerate-api.com)
+- Local Storage for favorites
+
+## Difficulty
+- **Beginner Level** - Basic JavaScript and API calls
+
+## Example APIs
+- Free Tier: [ExchangeRate-API](https://www.exchangerate-api.com)
+- Alternative: [Frankfurter API](https://www.frankfurter.app)
+
+## Learning Concepts
+- API Integration
+- Asynchronous JavaScript
+- DOM Manipulation
+- Error Handling
+- Local Storage
+
+## Project Ideas for Extension
+- Add cryptocurrency conversion
+- Create currency rate alerts
+- Build a currency comparison chart