add basic websocket server (#41)

server/.gitignore

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+__pycache__

server/README.md

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+# OpenDevin server
+```
+cd server
+python -m pip install -r requirements.txt
+uvicorn server:app --reload --port 3000
+```

server/requirements.txt

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+fastapi
+uvicorn

server/server.py

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+from fastapi import FastAPI, WebSocket
+
+app = FastAPI()
+
+@app.websocket("/ws")
+async def websocket_endpoint(websocket: WebSocket):
+    await websocket.accept()
+    while True:
+        data = await websocket.receive_text()
+        await websocket.send_text(f"Message text was: {data}")