Added header to conditionals_personal.
Added Intro alert.
Added prompt for user to enter age variable, and validated in console.
Added prompt for user to enter sleep data to variable, and validated in console.
Added to given constants. Recommended amount of sleep for adults and children.
Added conditional for adult with sleep variable >= constant. validated in console.
Added 'else if' conditional for  18 years and older where the sleep variable is less than the recommended sleep constant.
Added two conditionals for ages younger than 18, and validated in console. Completed.