add a link to the one hour code lab dartlanguage.org
step 1: blank badge
add instruction on how to run the app
add a text input to write your name
add an event listener to the input field using the function 'querySelector'
fix dart warning by casting e.target to an InputElement
add an input button to generate a name when the input text is empty
generate a new name/badget when the user clicks the button
refactor: remove duplication
enable/disable the button if the user wrote her name or not