[Docs] Add chinese docs

[ToumaKazusa3]

This RP adds seven chinese documentations as follow

• docs/useful_tools_scripts.md
• docs/change_log.md
• docs/tutorials/config.md
• docs/tutorials/config_vid.md
• docs/tutorials/config_mot.md
• docs/tutorials/config_sot.md
• docs/tutorials/customize_dataset.md

[codecov]

Codecov Report

Merging #248 (f8c8255) into master (a1fb68b) will decrease coverage by 0.48%.
The diff coverage is n/a.

❗ Current head f8c8255 differs from pull request most recent head 41cd013. Consider uploading reports for the commit 41cd013 to get more accurate results

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
- Coverage   68.90%   68.41%   -0.49%     
==========================================
  Files          87       87              
  Lines        4563     4563              
  Branches      890      890              
==========================================
- Hits         3144     3122      -22     
- Misses       1134     1154      +20     
- Partials      285      287       +2     

Flag	Coverage Δ
unittests	68.37% <ø> (-0.47%)	⬇️

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

Impacted Files	Coverage Δ
mmtrack/models/mot/trackers/tracktor_tracker.py	63.95% <0.00%> (-15.12%)	⬇️
mmtrack/datasets/pipelines/transforms.py	85.31% <0.00%> (-2.82%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a1fb68b...41cd013. Read the comment docs.