Add simplified Chinese translation to the 2ed book 1 'Get Started'

[liunnn1994]

Yes, I promise I've read the Contributions Guidelines (please feel free to remove this line).

Specifically quoting these guidelines regarding typos:

Typos?

Please don't worry about minor text typos. These will almost certainly be caught during the editing process.

If you're going to submit a PR for typo fixes, please be measured in doing so by collecting several small changes into a single PR (in separate commits). Or, just don't even worry about them for now, because we'll get to them later. I promise.

---

Please type "I already searched for this issue":

Edition: 2ed-zh-CN

Book Title: Get Started

Chapter: All of theme

Section Title: All of theme

Topic: none

Closes #1831 #1729