HAL9000 V0.3

Fix cross-platform error, which was due to IDE settings being set to Java 13.
Update populating sample data for first-time users.

HAL9000 V0.2

New updates this version:

1. GUI
2. Help page and user guide.
3. Sample data populated at the start to get you started

Duke / Hal9000 Version 0.1

HAL9000 is a chat bot that helps you keep track of your to-do list, mark what is done and delete the task when you feel like.
For this version:
- Supports 3 types of tasks: todo, deadline and event. Format will be included in user-guide
- Supports find with keyword
- No UI, run via terminal