v2.0

A-Release

v1.0

Merge branch 'branch-Level-7'

* branch-Level-7:
  Allow Duke to save tasks inputted by user to hard disk
  Add read file function to Duke Chatbot

# Conflicts:
#	src/main/java/Duke.java
#	src/main/java/Event.java
#	src/main/java/Todo.java

resolve conflicts