Update main.py

main.py

@@ -8,6 +8,10 @@ app = FastAPI()
 
 BASE_URL = 'https://doi.org/'
 
+@app.get("/")
+def read_root():
+    return {"Hello": "Welcome to doi2ref, a GPTs who can turn doi into various reference formats"}
+
 @app.get("/title2ref/")
 async def title2doi(title:str):
     cr = Crossref()