testing

Simple_Substitution/README.md

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+# Simple Substitution Cipher
+
+## Description
+A simple substitution cipher replaces each letter in the plaintext with another letter from the alphabet, based on a predetermined key.
+
+## How to Build
+1. Navigate to the `build` directory.
+2. Run `make` to compile the project.
+
+## How to Run
+1. After building, you will find an executable named `substitution_cipher` in the `build` directory.
+2. Run it using `./substitution_cipher`.
+
+## How to Clean
+- Run `make clean` in the `build` directory to remove all compiled files.