docs: Add LocalTrainerClient example notebook

[eoinfennessy]

What this PR does / why we need it:

Adds an example notebook to accompany kubeflow/sdk#13, which introduces the LocalTrainerClient.

[google-oss-prow]

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Pull Request Test Coverage Report for Build 15469191274

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• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 28.807%

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Totals
Change from base Build 15465054454:	0.0%
Covered Lines:	840
Relevant Lines:	2916

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This pull request has been automatically closed because it has not had recent activity. Please comment "/reopen" to reopen it.

[andreyvelich]

@szaher @eoinfennessy @kramaranya Please can someone finalize this PR to add example for local TrainerClient?
/reopen

[google-oss-prow]

@andreyvelich: Reopened this PR.

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In response to this:

@szaher @eoinfennessy @kramaranya Please can someone finalize this PR to add example for local TrainerClient?
/reopen

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[andreyvelich]

/milestone v2.1

[kramaranya]

Closing this PR since @briangallagher has opened #2869
/close

[google-oss-prow]

@kramaranya: Closed this PR.

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In response to this:

Closing this PR since @briangallagher has opened #2869
/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.