Add least action example and output ignore rules

examples/case01/run_case.py

@@ -0,0 +1,20 @@
+from pathlib import Path
+import subprocess
+import sys
+
+
+def main() -> None:
+    case_dir = Path(__file__).resolve().parent
+    root_dir = case_dir.parent.parent
+    input_path = case_dir / "input" / "input.txt"
+    output_path = case_dir / "output" / "result.txt"
+    program_path = root_dir / "least_action.py"
+
+    subprocess.run(
+        [sys.executable, str(program_path), str(input_path), str(output_path)],
+        check=True,
+    )
+
+
+if __name__ == "__main__":
+    main()