improve README

cua_lite/data/preproc/README.md

@@ -1,5 +1,70 @@
 ## Standardized dataset format
 Please see [`ZHZisZZ/test`](https://huggingface.co/datasets/ZHZisZZ/test) for an example.
+
+Standardized action space (refer to Qwen3-VL): 
+```
+description_prompt = "
+* `key`: Performs key down presses on the arguments passed in order, then performs key releases in reverse order.
+* `type`: Type a string of text on the keyboard.
+* `mouse_move`: Move the cursor to a specified (x, y) pixel coordinate on the screen.
+* `left_click`: Click the left mouse button at a specified (x, y) pixel coordinate on the screen.
+* `left_click_drag`: Click and drag the cursor to a specified (x, y) pixel coordinate on the screen.
+* `right_click`: Click the right mouse button at a specified (x, y) pixel coordinate on the screen.
+* `middle_click`: Click the middle mouse button at a specified (x, y) pixel coordinate on the screen.
+* `double_click`: Double-click the left mouse button at a specified (x, y) pixel coordinate on the screen.
+* `triple_click`: Triple-click the left mouse button at a specified (x, y) pixel coordinate on the screen (simulated as double-click since it's the closest action).
+* `scroll`: Performs a scroll of the mouse scroll wheel.
+* `hscroll`: Performs a horizontal scroll (mapped to regular scroll).
+* `wait`: Wait specified seconds for the change to happen.
+* `terminate`: Terminate the current task and report its completion status.
+* `answer`: Answer a question.
+** Note: all coordinates should be normalized to the range 0-1000."
+
+tools_def = {
+    "type": "function",
+    "function": {
+        "name_for_human": "computer_use",
+        "name": "computer_use",
+        "description": description_prompt,
+        "parameters": {
+            "type": "object",
+            "required": ["action"],
+            "properties": {
+                "action": {
+                    "type": "string",
+                    "description": description_prompt,
+                    "enum": [
+                        "key",
+                        "type",
+                        "mouse_move",
+                        "left_click",
+                        "left_click_drag",
+                        "right_click",
+                        "middle_click",
+                        "double_click",
+                        "scroll",
+                        "wait",
+                        "terminate"
+                    ]
+                },
+                "keys": {"type": "array", "description": "Required only by `action=key`."},
+                "text": {"type": "string", "description": "Required only by `action=type`."},
+                "coordinate": {"type": "array", "description": "The x,y coordinates for mouse actions."},
+                "pixels": {"type": "number", "description": "The amount of scrolling."},
+                "time": {"type": "number", "description": "The seconds to wait."},
+                "status": {
+                    "type": "string",
+                    "description": "The status of the task.",
+                    "enum": ["success", "failure"]
+                }
+            }
+        },
+        "args_format": "Format the arguments as a JSON object."
+    }
+}
+```
+
+Standardized conversation format in the dataset:
 ```
 # Dataset row format
 Each dataset row must contain exactly two keys: `images` and `messages`.