[Docs] Improve the ResNet model page.

[mzr1996]

Add ResNet introduction and how to use section.

[codecov]

Codecov Report

Base: 0.02% // Head: 91.12% // Increases project coverage by +91.10% 🎉

Coverage data is based on head (4d1e493) compared to base (b8b31e9).
Patch has no changes to coverable lines.

❗ Current head 4d1e493 differs from pull request most recent head 71f0530. Consider uploading reports for the commit 71f0530 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##           dev-1.x    #1118       +/-   ##
============================================
+ Coverage     0.02%   91.12%   +91.10%     
============================================
  Files          121      138       +17     
  Lines         8217    10232     +2015     
  Branches      1368     1614      +246     
============================================
+ Hits             2     9324     +9322     
+ Misses        8215      687     -7528     
- Partials         0      221      +221     

Flag	Coverage Δ
unittests	91.12% <ø> (+91.10%)	⬆️

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

Impacted Files	Coverage Δ
mmcls/apis/inference.py	0.00% <0.00%> (ø)
mmcls/datasets/transforms/compose.py
mmcls/engine/hooks/retriever_hooks.py	72.72% <0.00%> (ø)
mmcls/models/backbones/efficientformer.py	95.08% <0.00%> (ø)
mmcls/structures/utils.py	77.77% <0.00%> (ø)
mmcls/models/necks/reduction.py	100.00% <0.00%> (ø)
mmcls/models/backbones/hornet.py	82.05% <0.00%> (ø)
mmcls/models/retrievers/image2image.py	92.38% <0.00%> (ø)
mmcls/models/backbones/edgenext.py	95.20% <0.00%> (ø)
mmcls/models/utils/layer_scale.py	86.66% <0.00%> (ø)
... and 128 more

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