Add citations

[galopyz]

Hi, @ncoop57

Adding an example to use citations in claudette as stated in #53.
I am still new to git, claudette, and open source projects, so I might have messed up something.

I only provided an example to use plain text. PDF takes many tokens, but if we want to have a PDF example, I could find a small one and show how it can be used.
When using citations, Claude responds with alternating text and citation blocks. The response doesn't look pretty because only the first text block is shown without any citation blocks.

Please let me know if I need to make any corrections.
Thanks.

[gitnotebooks]

Found 1 changed notebook. Review the changes at https://app.gitnotebooks.com/AnswerDotAI/claudette/pull/58

[ncoop57]

Thanks @galopyz for this PR! its coming together nicely 🤓 How about we work on getting the response to look better especially when it does a lot of citations? If you look at Simon Willison's blog post on it, he has a little section on rendering these citations: https://simonwillison.net/2025/Jan/24/anthropics-new-citations-api/#rendering-the-citations. How about you see if you could add something similar?

[galopyz]

Hi, @ncoop57
I have added those changes to display messages with citations as block quotes.
I have merged my branch from AnswerDotAI:main because mine was behind, and there are many changes in gitnotebooks. Should I revert this change?

Let me know if anything needs to be changed. And should I run the whole notebooks? To make sure I didn't break anything? I tried my best to follow coding style and not break anything.