Add hook example

[JopjeKnopje]

Description

I've added a small example on how to use hooks with Jobs, I missed this piece of information myself when setting up klu.

Based on the discussion#13390

Type of change

• Content change (Adding content, Changing content, Fix typo)

All Submissions:

• A corresponding issue exists
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• Have you lint your code locally before submission?
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
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