Added Vigenere Cipher script in Python by Theekshani

[TheekshaniPramodya]

This script implements basic encryption and decryption using the Vigenère cipher algorithm. Written by Theekshani for educational use.

[TheekshaniPramodya]

Hi! 👋

📌 This script implements basic encryption and decryption using the Vigenère cipher in Python.

🛠️ It allows users to:

• Enter a plaintext message
• Enter a keyword
• Get an encrypted result
• Decrypt it back to the original text

👩‍💻 Created by @TheekshaniPramodya for educational purposes.

✅ No external libraries used, simple and beginner-friendly.

Happy to contribute! 🚀

– Theekshani