Add usage.md

usage.md

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+# Proof of Work Challenge Solver
+
+This document provides instructions for compiling and running the Proof of Work Challenge Solver implemented in C and Ruby.
+
+## Requirements
+
+Before running the scripts, ensure you have the following utilities installed on your system:
+
+- **argon2**: A secure hashing algorithm for password hashing.
+- **xxd**: A tool for creating a hex dump from a binary file and vice versa.
+- **bc**: An arbitrary precision calculator language.
+
+### Install Required Utilities
+
+On Ubuntu/Debian-based systems, you can install the required utilities using:
+
+```bash
+sudo apt update
+sudo apt install argon2 xxd bc
+```
+```bash
+gcc -o solver solver.c -lm
+./proof_of_work "262144:1:SALTe7e590c2f902:1500"
+```
+```bash
+ruby proof_of_work.rb "262144:1:SALTe7e590c2f902:1500"
+```
+
+### Summary of the Markdown Content
+
+- **Requirements**: Lists required utilities and how to install them.
+- **C Version**: Instructions for compiling and running the C program, including example output.
+- **Ruby Version**: Instructions for running the Ruby script, including example output.
+- **Conclusion**: Encourages the user to follow the instructions for successful execution.
+
+You can save the above content in a file named `README.md`. Let me know if you need any further modifications!