Feature cli enhancement

[nunster3000]

Description

Title:

🚀 Added Interactive Command-Line Interface (CLI) for Currency Converter

Description:

This pull request enhances the Currency Converter project by implementing a Command-Line Interface (CLI), allowing users to dynamically input conversion details instead of using hardcoded values. The enhancement significantly improves user experience, flexibility, and usability.

🔹 Key Enhancements:
✅ Interactive CLI Input

Users can enter the amount, source currency, and target currency dynamically.
Eliminates the need for hardcoded values.
✅ Error Handling for Invalid Inputs

Prevents crashes by handling incorrect inputs gracefully.
Displays user-friendly messages for invalid amounts and currency codes.
✅ Integration with Exchange Rate API

Fetches real-time currency exchange rates using https://api.exchangerate-api.com/.
✅ Formatted Output for Better Readability

Displays conversion results in an easy-to-read format.
🔹 Why This Improvement?
Before: The script used hardcoded values, requiring manual edits for different conversions.
Now: The CLI makes the tool dynamic and user-friendly, allowing users to enter inputs interactively.
Error handling ensures the script does not crash due to invalid input.
🔹 Code Changes:
Modified currency-converter.py to:

Implement CLI with input() for user interaction.
Format output for better readability.
Enhance error handling for incorrect inputs.

Checklist:

Please tick all the boxes that are fulfilled by your Pull Request.

• I have named my files and folder, according to this project's guidelines.
• My code follows the style guidelines of this project.
• I have commented on my code, particularly in hard-to-understand areas.
• I have created a helpful and easy to understand README.md, according to the given README_TEMPLATE.
• My changes do not produce any warnings.