Completed A-JUnit

Completed Level A-JUnit

Completed A-CodingStandard

Completed A-CodingStandard

Used Checkstyle to ensure coding standard is met

Completed A-Gradle

Added Gradle to the project

A-MoreOOP

Completed Level A-MoreOOP.

Level-8

Completed Level 8: Dates and Times
Merged branch into master

Level-7

Completed Level-7: Save.
Merged branch into master.

Level-6

Completed Level-6: Delete

Level-5

Completed Level-5: Handle Errors

Level-4

Completed Level 4: ToDos, Events, Deadlines

Level-3

Completed Level 3: Mark as Done.

Implemented "todo" command from Level 4 to add tasks.