Create app.py

app.py

@@ -0,0 +1,11 @@
+from fastapi import FastAPI
+from pydantic import BaseModel
+
+app = FastAPI()
+
+class Req(BaseModel):
+    message: str
+
+@app.post("/chat")
+def chat(req: Req):
+    return {"reply": f"AI says: {req.message}"}