* An application tool that uses Firebase's Cloud Firestore + Storage as data storage. * Please complete the Firebase account application before use. Apply for teaching: http://shioulo.no-ip.org/GetFirebase step: 1. Apply for an account 2. Create a project 3. Create an account in the project () 4. Turn on Cloud Firestore function 5. Turn on the storage function 6. Obtain the google-services.json file in the project setting function 1. Use the free cloud database Firestorn to create a shift sched