Add `Add_prefixes.ipynb` into examples/prompting

[iambogeumkim]

It took a while to clean up the branch commit history, but now the real work is done. Thanks to @andycandy for his kind help.

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I checked the Gemini API docs, and it seems like the 'Add prefixes' section under prompting strategies is the only part missing an example file. So, I've added a simple example file for prefixes.

I carefully reviewed the PR and repository this time, and I hope this file is helpful for the cookbook repository 😇 Any feedback is welcome!

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[iambogeumkim]

@Giom-V I was wondering if you could comment on this PR?

[iambogeumkim]

@Giom-V I changed files based on your reviews.

[andycandy]

@nsbg Your branch has some conflicts that you’ll need to resolve first. Once that’s sorted, everything else looks good to me!

[iambogeumkim]

@andycandy ah okay thanks for your review!

[andycandy]

Good work @nsbg!