V1.4 submission version

Final submission version for iP.

V1.3

Added simple commands while keeping old commands and added importance tag to prioritize tasks.

V1.22

Added an additional guard to prevent empty task details to be stored.

V1.21

Fixes bug regarding delete tasks and find tasks and add icons and title to GUI window.

v1.2

Angela with the first release of a working Graphical User Interface!

Angela v1.11

Fixed search functionality issues with v1.1.

Angela v.1

Very first release of Angela for CS2103T iP.