feat(Update doc index):

docs/external_module.md

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+## Module Interface Documentation
+
+The `Module` class interface provides a standardized way to create and use modules in the `agentic_security` project.
+
+Here is an example of a module that implements the `ModuleProtocol` interface. This example shows how to create a module that processes prompts and sends results to a queue.
+
+
+```python
+from typing import List, Dict, Any, AsyncGenerator
+import asyncio
+from .module_protocol import ModuleProtocol
+
+class ModuleProtocol(ModuleProtocol):
+    def __init__(self, prompt_groups: List[Any], tools_inbox: asyncio.Queue, opts: Dict[str, Any]):
+        self.prompt_groups = prompt_groups
+        self.tools_inbox = tools_inbox
+        self.opts = opts
+
+    async def apply(self) -> AsyncGenerator[str, None]:
+        for group in self.prompt_groups:
+            await asyncio.sleep(1) 
+            result = f"Processed {group}"
+            await self.tools_inbox.put(result)
+            yield result
+```
+
+#### Usage Example
+
+```python
+import asyncio
+import ModuleProtocol
+
+tools_inbox = asyncio.Queue()
+prompt_groups = ["group1", "group2"]
+opts = {"max_prompts": 1000, "batch_size": 100}
+
+module = ModuleProtocol(prompt_groups, tools_inbox, opts)
+
+async def main():
+    async for result in module.apply():
+        print(result)
+
+asyncio.run(main())
+```
+