Added the function for inputting tier name. Updated the guidance related to tier name,

Update app.py

Added validation of data format (#1)

Update README.md

Update README.md

Update the description

Update README.md

Update description

debug on the first formal version

First successful version

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Update app.py

Create app.py

initial commit