Feature-sprint3-han-Implement authentication using AWS Cognito

[HowardKuoooo]

Added the new files.

• Account.js

• Login.js

• Singup.js

• Status.js

• UserPool.js

[QuincyPowell]

I believe this PR can be fixed in the future. If merged now, it would make a mess.

[QuincyPowell]

Resolved merge conflicts with Han and updated the branch / PR. Ready to be merged.