Add metadata for episode 1

episodes/test/episode_000001_metadata.json

@@ -0,0 +1,12 @@
+{
+  "episode_idx": 1,
+  "timestamp": "2025-07-30T19:21:52.122357",
+  "fps": 50,
+  "duration": 11.960000038146973,
+  "frames": 599,
+  "camera_names": [
+    "cam_main",
+    "cam_wrist"
+  ],
+  "task_name": "test"
+}