Task 3: Set up readme.md

[Jenny-Ch]

Please set up the file readme.md with the following contents, which will be displayed automatically when entering this repo.

You have to finish these:

1. Set up 3 headings: Introduction, Code, and Contributors
2. Under Introduction, write a short summary of things your team will do according to the tasks inside the issues folder
3. Ensure your readme.md article is well-formatted with Markdown

This page might be useful for you: https://guides.github.com/features/mastering-markdown/

[AaaaronNg]

(assigning myself to this task)

[Vectorial1024]

Btw, is this done? We should close this if this task is already finished.