Add quick start and utils for extracting code blocks (#404)

* Add quick start and utils for extracting code blocks

* format

* Spelling

python/tests/execution/test_extract_code_blocks.py

@@ -0,0 +1,37 @@
+from agnext.components.code_executor import extract_markdown_code_blocks
+
+
+def test_extract_markdown_code_blocks() -> None:
+
+    text = """# This is a markdown text
+```python
+print("Hello World")
+```
+"""
+
+    code_blocks = extract_markdown_code_blocks(text)
+
+    assert len(code_blocks) == 1
+    assert code_blocks[0].language == "python"
+    assert code_blocks[0].code == 'print("Hello World")\n'
+
+
+    text = """More markdown text
+```python
+print("Hello World")
+```
+
+Another code block.
+
+```python
+print("Hello World 2")
+```
+"""
+
+    code_blocks = extract_markdown_code_blocks(text)
+
+    assert len(code_blocks) == 2
+    assert code_blocks[0].language == "python"
+    assert code_blocks[0].code == 'print("Hello World")\n'
+    assert code_blocks[1].language == "python"
+    assert code_blocks[1].code == 'print("Hello World 2")\n'