added a migrate.py file

migrate.py

+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+from flask_migrate import Migrate
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///site.db'
+db = SQLAlchemy(app)
+migrate = Migrate(app, db)

my_flask_app.py

@@ -88,4 +88,8 @@ def download_assessment(filename):
         abort(500) 
 
 if __name__ == '__main__':
+    with app.app_context():
+        db.create_all()
     app.run(debug=True, port=int(os.environ.get('PORT', 8080)))
+
+