[Docs] CN tutorials

[dreamerlin]

1. I am dying
2. Didn't think too much about the document structure

[dreamerlin]

@congee524 may help to find CN language support for readthedocs like this:

[codecov]

Codecov Report

Merging #665 (424c27e) into master (ea0e722) will decrease coverage by 0.09%.
The diff coverage is 61.53%.

@@            Coverage Diff             @@
##           master     #665      +/-   ##
==========================================
- Coverage   84.69%   84.59%   -0.10%     
==========================================
  Files         130      130              
  Lines        9338     9357      +19     
  Branches     1572     1578       +6     
==========================================
+ Hits         7909     7916       +7     
- Misses       1034     1042       +8     
- Partials      395      399       +4     

Flag	Coverage Δ
unittests	84.58% <61.53%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmaction/datasets/pipelines/augmentations.py	94.83% <ø> (ø)
mmaction/models/backbones/resnet3d_slowfast.py	82.65% <33.33%> (-1.96%)	⬇️
mmaction/core/evaluation/eval_hooks.py	84.37% <55.55%> (-1.72%)	⬇️
mmaction/models/recognizers/base.py	64.54% <75.00%> (+0.46%)	⬆️
mmaction/models/recognizers/recognizer2d.py	98.03% <100.00%> (-0.04%)	⬇️
mmaction/models/heads/lfb_infer_head.py	45.00% <0.00%> (-2.50%)	⬇️

---

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[congee524]

tooooo much... (o|o)
I'll see it later.

[congee524]

@congee524 @irvingzhang0512 How about checkpoint -> 模型检查点文件 ?

agree with it.

[congee524]

Here you may need to confirm whether you need italics 原始配置 or underline word _原始配置_

[dreamerlin]

Just to keep the same with English one

[congee524]

@innerlee Could it be merged now?

[congee524]

@innerlee ping :p