Add python example documentation for LegacyViewingPipeline

[doug-walker]

On this page: https://opencolorio.readthedocs.io/en/latest/guides/developing/developing.html
extend the example to include python code from here:
https://opencolorio.org/old/developers/usage_examples.html
in the section "Displaying an image, using the CPU (Full Display Pipeline)."

The python binding to be demonstrated is here:
/usr/local/workspace/OpenColorIO-personal/src/bindings/python/apphelpers/PyLegacyViewingPipeline.cpp
See also:
/usr/local/workspace/OpenColorIO-personal/tests/python/LegacyViewingPipelineTest.py

[adeskmr]

@doug-walker if this has not been updated yet, I would like to tackle this doc change. Am relatively new to open source and would love to start with this one.

[doug-walker]

Great, thanks for your help @adeskmr.

[doug-walker]

This issue is still open. There are lots of hints in the PRs above that were not completed. Should be easy to complete.

[arcasX115]

If this is still an issue and if it's still open then I would like to contribute to it

[doug-walker]

Great, thanks for your help @arcasX115 .

[doug-walker]

This issue is still open for someone.

[shaneantrim]

Hey @doug-walker I think this one is pretty straight-forward copy and paste, do you mind assigning it to me?