ssh linux commands made easy with html webform with pre-build core commands, and space to names, users, password adding

Customer uses web app Web app has no admin control panel to add new users, delete users, add passwords to the users, add emails of users to their accounts, allocate file size quota limit of users. Al this can be configured in the database of the web app using ssh line commands. But my customer doesnt know how to use ssh and line commands. I neeed a control panel to add users and above config