docs: Update readme info on creating model objects #245
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Fixes #238
What was the problem/requirement? (What/Why)
Some of the sample code in the README.md no longer worked after the change for RFC 0002.
https://github.com/OpenJobDescription/openjd-specifications/blob/mainline/rfcs/0002-model-extensions.md updated OpenJD to make the fields and validation of template components depend on an 'extensions' property at the top level of the template. Implementing this in the model library involved adding a model parsing context that objects look at during construction and validation.
What was the solution? (How)
This change adds a docstring for the parse_model function and updates the broken examples to explain how the extensions fit in and how to create model objects.
What is the impact of this change?
All the sample code in README.md works again.
How was this change tested?
I copy/pasted all the code samples into a Jupyter notebook and saw that they worked.
Was this change documented?
It is docs.
Is this a breaking change?
No
Does this change impact security?
No
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