[i18n-zh] Translating docs to Chinese (Simplified)

Hi!

Let's bring the documentation to all the -speaking community (currently 0 out of 267 complete)

Who would want to translate? Please follow the TRANSLATING guide. Here is a list of the files ready for translation. Let us know in this issue if you'd like to translate any, and we'll add your name to the list.

Some notes:

• Please translate using an informal tone (imagine you are talking with a friend about transformers ).
• Please translate in a gender-neutral way.
• Add your translations to the folder called <languageCode> inside the source folder.
• Register your translation in <languageCode>/_toctree.yml; please follow the order of the English version.
• Once you're finished, open a pull request and tag this issue by including #issue-number in the description, where issue-number is the number of this issue. Please ping @stevhliu and @MKhalusova for review.
• If you'd like others to help you with the translation, you can also post in the forums.

And I can see some part of the work has be done (Great work!). I just list all files below.

Get Started section(keep updating)

Here is what I am working now, you can just skip these docs. perf_train_gpu_one.md perf_train_gpu_many.md perf_train_cpu.md perf_train_cpu_many.md perf_train_tpu.md perf_train_tpu_tf.md perf_train_special.md perf_infer_cpu.md deepspeed.md trainer.md - #29728

@stevhliu