Add matting colab tutorial

[hejm37]

No description provided.

[codecov]

Codecov Report

Merging #111 into master will increase coverage by 0.18%.
The diff coverage is 96.15%.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
+ Coverage   82.24%   82.43%   +0.18%     
==========================================
  Files         143      143              
  Lines        6500     6591      +91     
  Branches      967      980      +13     
==========================================
+ Hits         5346     5433      +87     
- Misses       1059     1060       +1     
- Partials       95       98       +3     

Flag	Coverage Δ
#unittests	82.43% <96.15%> (+0.18%)	⬆️

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

Impacted Files	Coverage Δ
mmedit/apis/generation_inference.py	23.07% <ø> (ø)
mmedit/apis/inpainting_inference.py	30.76% <ø> (ø)
mmedit/apis/matting_inference.py	19.51% <ø> (ø)
mmedit/apis/restoration_inference.py	16.66% <ø> (ø)
mmedit/apis/train.py	21.62% <ø> (ø)
mmedit/datasets/pipelines/loading.py	96.48% <ø> (ø)
...ones/encoder_decoders/decoders/deepfill_decoder.py	88.63% <ø> (ø)
.../backbones/encoder_decoders/decoders/gl_decoder.py	100.00% <ø> (ø)
...ones/encoder_decoders/decoders/indexnet_decoder.py	100.00% <ø> (ø)
...ckbones/encoder_decoders/decoders/pconv_decoder.py	28.12% <ø> (ø)
... and 42 more

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