Get useruid

[kotinos]

1.) Create a function that grabs the useruid 2.) Convert the useruid to a string 3.) push to database under document users

[kotinos]

Task tests: 1.) Log in 2.) Run function 3.) check database for useruid 4.) check if useruid matches 5.) relog and see if the useruid is still the same and not another is created

[kotinos]

test passed