Add 3d demo into demo/README.md

[ly015]

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[codecov]

Codecov Report

Merging #670 (665eccf) into master (b3999e7) will decrease coverage by 0.15%.
The diff coverage is n/a.

❗ Current head 665eccf differs from pull request most recent head 99f41e8. Consider uploading reports for the commit 99f41e8 to get more accurate results

@@            Coverage Diff             @@
##           master     #670      +/-   ##
==========================================
- Coverage   82.83%   82.68%   -0.16%     
==========================================
  Files         169      169              
  Lines       12272    12151     -121     
  Branches     1985     1985              
==========================================
- Hits        10166    10047     -119     
+ Misses       1600     1598       -2     
  Partials      506      506              

Flag	Coverage Δ
unittests	82.68% <ø> (-0.16%)	⬇️

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

Impacted Files	Coverage Δ
mmpose/datasets/dataset_wrappers.py	50.00% <0.00%> (-4.55%)	⬇️
mmpose/models/detectors/base.py	53.65% <0.00%> (-4.12%)	⬇️
mmpose/datasets/datasets/mesh/mesh_h36m_dataset.py	22.41% <0.00%> (-2.59%)	⬇️
mmpose/core/fp16/hooks.py	25.00% <0.00%> (-2.28%)	⬇️
mmpose/core/camera/camera_base.py	78.57% <0.00%> (-1.43%)	⬇️
mmpose/datasets/datasets/face/face_base_dataset.py	76.47% <0.00%> (-1.31%)	⬇️
mmpose/core/utils/regularizations.py	80.00% <0.00%> (-1.25%)	⬇️
mmpose/datasets/pipelines/loading.py	85.71% <0.00%> (-0.96%)	⬇️
mmpose/datasets/pipelines/top_down_transform.py	61.44% <0.00%> (-0.91%)	⬇️
mmpose/datasets/pipelines/shared_transform.py	80.62% <0.00%> (-0.88%)	⬇️
... and 38 more

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