Add Chemistry AI learning resource

[linnfeng]

Adds a resource metadata entry for Chemistry AI, a fast web-based chemistry learning tool with step-by-step explanations.

• Adds the required title, date, link, and article type fields
• Targets jamstack:main from linnfeng:linnfeng-patch-2
• Uses the existing resource metadata format

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[matbrgz]

This adds a link to Chemistry AI (chemistryai.chat), a homework solver, which is an AI tool site rather than a Jamstack resource. The resources page collects articles, courses and talks about building with the Jamstack (static generation, headless CMSs, APIs, deployment), and this page doesn't cover any of those topics.

Reading it as a promotional link, I don't think it fits the collection. The title "Building Chemistry AI as a Fast Web-Based Learning Tool" suggests an article about how it was built, but the link goes to the product itself. See also #1086, #1088 and #1090.