Add mmocr

[quincylin1]

added mmocr link to readme.md

[codecov]

Codecov Report

Merging #5031 (f09a762) into master (6b185f0) will decrease coverage by 0.24%.
The diff coverage is n/a.

❗ Current head f09a762 differs from pull request most recent head 798d94a. Consider uploading reports for the commit 798d94a to get more accurate results

@@            Coverage Diff             @@
##           master    #5031      +/-   ##
==========================================
- Coverage   66.36%   66.11%   -0.25%     
==========================================
  Files         257      257              
  Lines       20077    20074       -3     
  Branches     3418     3418              
==========================================
- Hits        13324    13272      -52     
- Misses       6030     6071      +41     
- Partials      723      731       +8     

Flag	Coverage Δ
unittests	66.11% <ø> (-0.21%)	⬇️

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

Impacted Files	Coverage Δ
mmdet/models/roi_heads/mask_scoring_roi_head.py	55.35% <0.00%> (-32.15%)	⬇️
mmdet/models/dense_heads/rpn_test_mixin.py	77.41% <0.00%> (-6.46%)	⬇️
mmdet/models/roi_heads/mask_heads/maskiou_head.py	94.62% <0.00%> (-5.38%)	⬇️
mmdet/models/detectors/cornernet.py	94.87% <0.00%> (-5.13%)	⬇️
mmdet/models/roi_heads/test_mixins.py	54.08% <0.00%> (-3.78%)	⬇️
mmdet/models/dense_heads/corner_head.py	73.72% <0.00%> (-1.88%)	⬇️
mmdet/datasets/pipelines/transforms.py	71.37% <0.00%> (-1.24%)	⬇️
mmdet/datasets/custom.py	63.25% <0.00%> (-0.23%)	⬇️

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