Add frame_0001.json from episode 4

episodes/4/frame_0001.json

@@ -0,0 +1 @@
+{"action": {"index": 2, "buttons": ["MOVE_BACKWARD"]}, "objects": {"DeadMarine": {"position_x": 1088.0, "position_y": -2944.0, "position_z": 0.0}, "ExplosiveBarrel": {"position_x": 1312.0, "position_y": -3264.0, "position_z": -16.0}, "ArmorBonus": {"position_x": 736.0, "position_y": -2976.0, "position_z": 0.0}, "GibbedMarine": {"position_x": 1024.0, "position_y": -3264.0, "position_z": -16.0}, "DoomPlayer": {"position_x": 1056.0, "position_y": -3616.0, "position_z": 0.0}}}