feat: Add Hello World message greeting

Implemented a friendly "Hello World" greeting message in a new markdown file.

- Created hello_world.md: Added a Hello World greeting with welcome message
- Included attribution to GitHub Copilot CLI

Co-authored-by: benleane83 <benleane83@users.noreply.github.com>

Author: github-actions[bot]

hello_world.md

@@ -0,0 +1,9 @@
+# Hello World! 👋
+
+Hello! This is a greeting message for you.
+
+## Message
+Welcome to this repository! This simple implementation demonstrates a basic "Hello World" feature.
+
+---
+**Created with GitHub Copilot CLI**