Update README.md

README.md

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 **TSAIA** is an instruction-based evaluation dataset specifically designed for time series analysis tasks.
 
+![Alt text](./task_categorization.png)
+
 ## 📚 Dataset Structure
 
 The dataset comprises two subsets:
@@ -35,11 +37,11 @@ The dataset comprises two subsets:
 - `question_id`: Unique identifier for each question
 - `question_type`: Type of question
 - `prompt`: Natural language description of the task
-- `data_str`: Embedded time series data
 - `options`: A list of multiple-choice options
 - `answer`: The correct option(s)
-- `context`: Contextual information for the task
-- `constraint`: Constraints on output format or variable naming
+- `data_info`: Description of the data
+- `answer_info`: Description of the answer
+- `executor_variables`: Definitions of variables available for model execution
 
 ## 🔧 Usage