Create config_explain.md

Author: SalmonSung

docs/config_explain.md

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+## AgentBuilder Configuration
+
+The `AgentBuilder` class provides a configurable interface for setting up your agent's behavior. Below is the default configuration, optimized for OpenAI users (due to its popularity):
+
+```python
+class AgentBuilder:
+    def __init__(self,
+                 planner_provider="openai",
+                 planner_model="o3-mini",
+                 writer_provider="openai",
+                 writer_model="gpt-4.1-nano",
+                 file_type="CSV",
+                 index4file="true",
+                 breadth=2):
+        # Configurable parameters
+        self.planner_provider = planner_provider
+        self.planner_model = planner_model
+        self.writer_provider = writer_provider
+        self.writer_model = writer_model
+        self.file_type = file_type
+        self.index4file = index4file
+        self.breadth = breadth
+```
+
+### Parameter Explanations
+
+- **`file_type`**:  
+  The type of the original input file. Currently, only `CSV` files are supported.
+
+- **`index4file`**:  
+  Indicates whether the file includes an index column (typically the first column).  
+  Accepts `"true"` or `"false"` as string values.
+
+- **`breadth`**:  
+  Defines how many agents to invoke in parallel.  
+  Each agent will generate three ideas. Ideally resulting in three tools if the code passes LLM-based evaluation.