reformat readme

[stevenhwu]

I would recommend the following update for the README.md. This might be the only part the reviewer (different to the actual end user) look at. Let's use this as a showcase!

• Therefore, you want to describe the purpose and potential output for the programming at beginning.
• Generally, people put the installation section before the usage section. However, I would like to move usage and example higher up, incase the reviewers never got a chance to see it.
• In the example output section, treat this as a short demo or showcase of your program.

Generally, the coding is pretty good already, I will show you a few things to make your life easier in the future.

[stevenhwu]

Looks good, please merge everything into the main branch. When should we turn this into a public repo?

[yehzx]

How about we discuss this tomorrow? It's in my meeting agenda tomorrow (I'll update the agenda soon)