added fastapi simple example

examples/echo_fastapi_based_bot.py

@@ -1,12 +1,10 @@
-from fastapi_utils.inferring_router import InferringRouter
-from fastapi import FastAPI, status, HTTPException
 from aiogram import Bot, Dispatcher, types
-from fastapi_utils.cbv import cbv
+from fastapi import FastAPI
 import logging
 import asyncio
 
-
 API_TOKEN = "<TOKEN>"
+
 logging.basicConfig(level=logging.DEBUG)
 
 class AsyncioBot:
@@ -33,23 +31,15 @@ class AsyncioBot:
 
 app = FastAPI()
 bot = AsyncioBot()
-router = InferringRouter()
 
-@cbv(router)
-class MainServer:
-        
-    @app.on_event("startup")
-    async def on_startup():
-        await bot.run()
+@app.on_event("startup")
+async def on_startup():
+    await bot.run()
 
-    @router.get("/echo", status_code=status.HTTP_200_OK)
-    async def echo(self):
-        return {
-            "status": True
-        }
-    
-    @app.on_event("shutdown")
-    async def on_shutdown():
-        await bot.close() # closing bot without error
+@app.get("/")
+async def root():
+    return {"data": "Hello World"}
 
-app.include_router(router)
+@app.on_event("shutdown")
+async def on_shutdown():
+    await bot.close() # closing bot without error