docs(readme): Add batch size configuration documentation

文档(readme): 添加批处理大小配置说明

- Add documentation for insert_batch_size parameter in addon_params
- 在 addon_params 中添加 insert_batch_size 参数的文档说明

- Explain default batch size value and its usage
- 说明默认批处理大小值及其用途

- Add example configuration for batch processing
- 添加批处理配置的示例

README.md

@@ -278,10 +278,25 @@ class QueryParam:
 ### Batch Insert
 
 ```python
-# Batch Insert: Insert multiple texts at once
+# Basic Batch Insert: Insert multiple texts at once
 rag.insert(["TEXT1", "TEXT2",...])
+
+# Batch Insert with custom batch size configuration
+rag = LightRAG(
+    working_dir=WORKING_DIR,
+    addon_params={
+        "insert_batch_size": 20  # Process 20 documents per batch
+    }
+)
+rag.insert(["TEXT1", "TEXT2", "TEXT3", ...])  # Documents will be processed in batches of 20
 ```
 
+The `insert_batch_size` parameter in `addon_params` controls how many documents are processed in each batch during insertion. This is useful for:
+- Managing memory usage with large document collections
+- Optimizing processing speed
+- Providing better progress tracking
+- Default value is 10 if not specified
+
 ### Incremental Insert
 
 ```python
@@ -594,7 +609,7 @@ if __name__ == "__main__":
 | **llm\_model\_kwargs** | `dict` | Additional parameters for LLM generation |     |
 | **vector\_db\_storage\_cls\_kwargs** | `dict` | Additional parameters for vector database (currently not used) |     |
 | **enable\_llm\_cache** | `bool` | If `TRUE`, stores LLM results in cache; repeated prompts return cached responses | `TRUE` |
-| **addon\_params** | `dict` | Additional parameters, e.g., `{"example_number": 1, "language": "Simplified Chinese", "entity_types": ["organization", "person", "geo", "event"]}`: sets example limit and output language | `example_number: all examples, language: English` |
+| **addon\_params** | `dict` | Additional parameters, e.g., `{"example_number": 1, "language": "Simplified Chinese", "entity_types": ["organization", "person", "geo", "event"], "insert_batch_size": 10}`: sets example limit, output language, and batch size for document processing | `example_number: all examples, language: English, insert_batch_size: 10` |
 | **convert\_response\_to\_json\_func** | `callable` | Not used | `convert_response_to_json` |
 | **embedding\_cache\_config** | `dict` | Configuration for question-answer caching. Contains three parameters:<br>- `enabled`: Boolean value to enable/disable cache lookup functionality. When enabled, the system will check cached responses before generating new answers.<br>- `similarity_threshold`: Float value (0-1), similarity threshold. When a new question's similarity with a cached question exceeds this threshold, the cached answer will be returned directly without calling the LLM.<br>- `use_llm_check`: Boolean value to enable/disable LLM similarity verification. When enabled, LLM will be used as a secondary check to verify the similarity between questions before returning cached answers. | Default: `{"enabled": False, "similarity_threshold": 0.95, "use_llm_check": False}` |