docs: enhance README with purpose and contents sections (#2)

Author: FidelusAleksander

README.md

@@ -1 +1,14 @@
-# Skills Exercises Toolkit
+# Skills Exercises Toolkit :hammer_and_wrench:
+
+<p align="center">
+  <img src="https://octodex.github.com/images/manufacturetocat.png" alt="Manufacturetocat" width="300" />
+</p>
+
+## Purpose
+
+This repository serves as a comprehensive toolkit for creating and managing GitHub Skills exercises. It provides a collection of tools, templates, and utilities designed to streamline the process of developing educational content for GitHub Skills.
+
+## Contents
+
+- **[.github/workflows](/.github/workflows)**: GitHub Actions workflows for automating common parts of Skills Exercises
+- **[markdown-templates](/markdown-templates)**: Ready-to-use Markdown templates for creating consistent exercise documentation, instructions, and README files