[Docs] Add getting_started chinese version

[xiliu8006]

Motivation

Add getting_started.md chinese version.

[codecov]

Codecov Report

Merging #725 (9758cb8) into master (e58684a) will increase coverage by 0.11%.
The diff coverage is 55.81%.

❗ Current head 9758cb8 differs from pull request most recent head 6996285. Consider uploading reports for the commit 6996285 to get more accurate results

@@            Coverage Diff             @@
##           master     #725      +/-   ##
==========================================
+ Coverage   48.92%   49.03%   +0.11%     
==========================================
  Files         208      210       +2     
  Lines       15863    15964     +101     
  Branches     2544     2547       +3     
==========================================
+ Hits         7761     7828      +67     
- Misses       7607     7634      +27     
- Partials      495      502       +7     

Flag	Coverage Δ
unittests	49.03% <55.81%> (+0.11%)	⬆️

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

Impacted Files	Coverage Δ
mmdet3d/apis/test.py	15.78% <0.00%> (ø)
...et3d/core/bbox/iou_calculators/iou3d_calculator.py	26.31% <ø> (ø)
mmdet3d/core/bbox/structures/base_box3d.py	75.00% <ø> (ø)
mmdet3d/core/bbox/structures/box_3d_mode.py	92.10% <ø> (ø)
mmdet3d/core/bbox/structures/cam_box3d.py	77.23% <ø> (ø)
mmdet3d/core/bbox/structures/depth_box3d.py	84.09% <ø> (ø)
mmdet3d/core/bbox/structures/lidar_box3d.py	84.21% <ø> (ø)
mmdet3d/core/visualizer/show_result.py	66.38% <ø> (ø)
mmdet3d/datasets/kitti_mono_dataset.py	63.98% <ø> (-0.16%)	⬇️
mmdet3d/datasets/lyft_dataset.py	71.35% <ø> (ø)
... and 26 more

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[yezhen17]

是不是该说一下cuda 代码需要重新编译才能生效？