Update app.py

app.py

@@ -5,6 +5,10 @@ import subprocess
 
 app = Flask(__name__)
 
+@app.route('/', methods=['GET'])
+def hello():
+    return "Hello! This is an api server, and it is running successfully. For usage, please contact the person who hosted this api server."
+
 @app.route('/api/audio_separation', methods=['GET'])
 def audio_separation():
     # 获取MP3文件的直链地址