1-create a login screen: contains username, password, login button, register new user button
should also contain settings button. on click it should open a popup dialog to enter the location of sql server instance: ip/instance, user id and password
on click of the login button, it should validate the user credentials against the sql table. if successfull it will redirect the user to the app main screen
2-on click of register new user button, it will open a new form that allows the user to create a new account. it contains username, passsword, confirm password, first name, lastname, age, country, and sex, smoker. a save button should save the newly created user and automatically logs him in.
3-the main screen of the app now will just display the gps location of the user. if gps is turned off it should notify the user to turn it on.