Add readme for adaptive package

[addisonschultz]

This PR adds a readme to the @gitbook/adaptive helper package.

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Latest commit: c1efdea

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bun add https://pkg.pr.new/GitbookIO/integrations/@gitbook/api@880

commit: c1efdea

[spastorelli]

LGTM on my end. Thanks for doing this 🙏 . Approving to unblock.

Added one comment on changing the intro of the SDK.

[spastorelli]

I wonder if we should be more general at the start of the readme when describing what the SDK does as it also exposes generic utils like writeGitBookVisitorCookie to allow devs to also write cookies with their own data in case they don't use LD or Bucket. It may also intro additional helpers in the future to be used on the backend side for writing signed cookies (not yet implemented).

Also we should maybe have the first paragraph to introduce adaptive content (maybe link to the docs) and mention that this SDK provide utils to help facilitate passing data to GitBook for adapting their content.

And then add 2 sections:

• first one that talks specifically about FF helper
• another one that talks about the generic one writeGitBookVisitorCookie

@taranvohra what do you think?

[spastorelli]

I think we should only talk about LD and omit Bucket as we do in the UI:
https://gitbook.slack.com/archives/C08J001JLCD/p1750286067406389