wang0678 prac2 & 3  commit

add my master report:https://github.com/wang0678/report

add prac2 issue https://github.com/wang0678/se3prac2/issues/1
add test case for prac3 https://github.com/wang0678/se3prac3/commits/master
in prac4 I add more class for game https://github.com/wang0678/se3prac4/commits/master
add test plan for prac5 based on prac4 https://github.com/wang0678/se3prac5/blob/master/testPlan/testPlan.txt