v2.1 NUSchedule Release

This is the final release of this product.
Refer to the link below to use it.
https://ay2021s1-cs2113t-f14-4.github.io/tp/

NUSchdule version 2.0

Compare to version 1.0, now we have
done command
sort command
delete command
better location system
allows virtual location
user info
the compulsory end time for classes, the optional end time for personalEvents
find command
date command
locate command

first version

First version
Make the app at least have the following functions:
View commands: help
Add event: add
Personal event:
Assignments:
Classes:
Edit event: edit
Find the location: locate
View tasks: list
Clear tasks: clear

And also the main framework, and the Exceptions for each command

unzip data.zip in the same directory as NUSchedule.jar