Computer choice "getComputerChoice"
Random math to make his choice
if value 0, return rock
if else value 1, return paper
else return scissors

Player choice
Ask player input, has to not be case sensitive (can input between rock paper and scissors, majuscule ou pas)
store value as string in a variable

Keep score
Create player score = 0 and computer score = 0
If player win, increment +1 to his score and +1 to computer score if he wins

Plays 5 round or best of three, if player score 3 print "congratulation, you won"
If computer score hits 3, print "you lost"