[Docs] Add useful_tools.md Chinese version (#728)
* add useful_tools.md chinese version * typo fix * Merge branch 'master' of github.com:open-mmlab/mmdetection3d into add_useful_tools_cn * Revert "Merge branch 'master' of github.com:open-mmlab/mmdetection3d into add_useful_tools_cn" This reverts commit 90de7b67fbb63fa5c6ca162b53356e02250f1892. * fix typo * typo fix * typo fix
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