added comments and initial code

comments for code description and code for user input about bedtime
added second input code

second user input for time waking up added
added calculation and alert

added code for calculation and alert. upon testing, this does not
provide the correct amount of hours.
tried variation

tried to input 24h time but this provides incorrect hours as well.
reworked code

used simpler situation; the previous one would need to use code I
haven’t learned about.