Level-6

Level 6: Delete

Level-5

Level 5: Handle Errors

Level-4

Level 4: ToDos, Events, Deadlines

Level-3

Level 3: Mark as Done

Level-2

Level 2: Add, List

Level-1

Level 1: Greet, Echo, Exit

A-Gradle

Note: I had merged add-gradle-support a few days ago but I am unable to assign. The target version can be found in Release of v0.1 Duke/Tag: A-Jar.