Add application file

app.py

@@ -4,4 +4,8 @@ app = FastAPI()
 
 @app.get("/")
 def greet_json():
-    return {"Hello": "World!123"}
+    return {"Hello": "World!"}
+
+@app.get("/a")
+def greet_json():
+    return {"Hello": "a World!"}