Add test.py with add_numbers function

This adds a simple Python function to add two numbers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

test.py

@@ -0,0 +1,8 @@
+def add_numbers(a, b):
+    """返回两个数字的和"""
+    return a + b
+
+if __name__ == "__main__":
+    # 示例用法
+    result = add_numbers(3, 5)
+    print(f"3 + 5 = {result}")