feature: Create DataManagement Class which save tax invoice form to Database

Please add type as a prefix on your issue title:

feature: A new feature
fix: A bug fix
update: A patch on the existing feature which doesn't that big enough to be a new feature
refactor: A code changes which don't break existing features or software behavior

If your DataManagement class is the new feature for this project, the issue title should be feature: Create DataManagement Class which save tax invoice form to Database

cs-kmitl-2017 / example

feature: Create DataManagement Class which save tax invoice form to Database #59