update

app/main/__init__.py

@@ -1,3 +1,5 @@
 from flask import Blueprint
 
 main = Blueprint('main', __name__)
+
+from . import views, errors

app/main/views.py

@@ -0,0 +1,7 @@
+from . import main
+import json
+
+
+@main.route('/', methods=['GET', 'POST'])
+def index():
+    return json.dumps({'Message': 'Hello, world'})