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+# Challenge: Functions
+**Difficulty:** Easy
+**Language:** Python
+**Subject:** Modular Programming (Functions)
+
+## Description
+Write a function named `add_numbers` that takes two parameters, `a` and `b`, and returns their sum.
+
+## Requirements
+- Define the function `add_numbers(a, b)`.
+- Use the `return` keyword.
+- Call the function and print the result of adding 5 and 10.
+
+## Hints
+- `def add_numbers(a, b):` is the standard way to define a function.
+- Use `print(add_numbers(5, 10))` to see the result.
+
+## Validation
+- **Check:** `python3 -c "import main; print(main.add_numbers(5, 10))"`
+- **Expected Output:** 15