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-#EncryptDecrypt
-##James Hoole-Jackson
-##24026875
-------
+#EncryptDecrypt Tool
+
+This tool lets you both encrypt and decrypt files using three different ciphers:
+ - Caesar Cipher
+ - XOR Cipher
+ - Vigenere Cipher
+
+You run this tool in the terminal, choose which cipher you want, the program will ask you for a file and a key that you wish to use.
+
+---
+
+## Compiling
+
+Open the terminal and type:
+
+g++ main.cpp EncryptDecrypt.cpp Help.cpp -o EncryptDecrypt
+
+ This create a file called EncryptDecryptTool that you can run.
+
+---
+
+## Running the tool
+
+In the terminal, use this format to run the tool
+
+./EncryptDecrypt [encrypt/decrypt][cipher][filename][key]
+
+### Ciphers supported:
+- `caesar` — requires a **number** key (e.g. `3`)
+- `xor` — requires a **single character** key (e.g. `X`)
+- `vigenere` — requires a **word** or **string** key (e.g. `Secret`)
+
+---
+
+### Examples
+
+'''C++
+# Caesar encryption with the shift 16
+./EncryptDecrypt encrypt caesar file.txt 16
+
+# XOR decryption with key X
+./EncryptDecrypt decrypt XOR file.txt X
+
+# Vigenere encryption with the key SecretKey1234
+./EncryptDecrypt encrypt vigenere file.txt SecretKey1234
+
+```
+