Update README.md

Signed-off-by: de_soot <[email protected]>

Author: de-soot

README.md

@@ -1,9 +1,14 @@
 # Caesar Cipher CLI
-Caesar Cipher in the command line made in Python.
+Caesar Cipher in the command-line made in Python.
 
-Originally made for my school's computer science class homework assignment, but expanded to include extra features.
+Originally made for my school's computer science class homework assignment, but expanded upon to include extra features for fun.
 
 ## Features
+- Classic Caesar Cipher encryption gameplay
+- Customisable encryption key
+- Works for both capital and lowercase letters and numbers (alphanumeric)
+- Cycles back if out of bounds (e.g.: Z + 1 -> A ; 9 + 1 -> 0)
+- Decryption supported by inputting the negative of encryption keys
 
 ## Usage
 ### Local