add mock server (#214)

opendevin/mock/README.md

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+# OpenDevin mock server
+This is a simple mock server to facilitate development in the frontend.
+
+## Start the Server
+```
+python -m pip install -r requirements.txt
+python listen.py
+```
+
+Then open the frontend to connect to the mock server. It will simply reply to every received message.

opendevin/mock/listen.py

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+import uvicorn
+from fastapi import FastAPI, WebSocket
+
+app = FastAPI()
+@app.websocket("/ws")
+async def websocket_endpoint(websocket: WebSocket):
+    await websocket.accept()
+    # send message to mock connection
+    await websocket.send_json({"action": "initialize", "message": "Control loop started."})
+    
+    try:
+        while True:
+            # receive message
+            data = await websocket.receive_json()
+            print(f"Received message: {data}")
+
+            # send mock response to client
+            response = {"message": f"receive {data}"}
+            await websocket.send_json(response)
+            print(f"Sent message: {response}")
+    except Exception as e:
+        print(f"WebSocket Error: {e}")
+
+@app.get("/")
+def read_root():
+    return {"message": "This is a mock server"}
+
+if __name__ == "__main__":
+    uvicorn.run(app, host="127.0.0.1", port=3000)