docs: update README with case preservation feature

Author: imDarshanGK

README.md

@@ -1,4 +1,4 @@
-# Caesar Cipher in Python 🔐
+# Caesar Cipher in Python
 
 ## Overview
 This repository contains a Python implementation of the Caesar Cipher encryption algorithm. The Caesar Cipher is a substitution cipher where each letter in the plaintext is shifted by a fixed number of positions in the alphabet.
@@ -12,4 +12,4 @@ This repository contains a Python implementation of the Caesar Cipher encryption
 ## How It Works
 1. **Encryption**: Each letter in the plaintext is shifted by a specified number of positions down the alphabet.
 2. **Decryption**: Each letter in the ciphertext is shifted back by the same number of positions.
-3. **Case Preservation**: The program retains the original case of the input message, ensuring proper nouns and formatting are preserved.
+3. **Case Preservation**: The program retains the original case of the input message, ensuring proper nouns and formatting are preserved.