Merge pull request #42 from dolob-mrmr/hamzah

SysReq Stuff
done sequence diagram and usecase
Merge pull request #43 from dolob-mrmr/zhihao

done sequence diagram and usecase
class diagram halfdone
Merge pull request #44 from dolob-mrmr/zhihao

class diagram halfdone
class diagram done
Merge pull request #45 from dolob-mrmr/zhihao

class diagram done
communication diagram done
Merge pull request #46 from dolob-mrmr/zhihao

communication diagram done
adding state digram
Merge pull request #47 from dolob-mrmr/zhihao

adding state digram