Add a shipping invoice example notebook to accompany the blog post

[hayleypark]

Issue #, if available:

Description of changes:
Add a shipping invoice example notebook to accompany the blog post.

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[ayushi1208]

A couple comments on the notebook:

• Add title, headers, and descriptions of what each step is showing and how to interpret it
• Change the compare_with to evaluate to show the full capabilities
• Maybe use pretty print utils to make the output look nice

[hayleypark]

Thanks Ayushi!
I think I had addressed these two already:

• Add title, headers, and descriptions of what each step is showing and how to interpret it
• Change the compare_with to evaluate to show the full capabilities
  The latest commit incorporates pretty print utils.