Adding CLA assistant and updating READMEs

[Andrew5194]

Adds a CLA assistant via GitHub Actions so that contributions to Baseline are automatically handled with respect to licensing agreements.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
baseline	Ready	Preview, Comment	May 23, 2026 11:21pm

[github-actions]

Thank you for your contribution to Baseline! Before we can merge this PR, we need you to sign the Contributor License Agreement.

Please read the Baseline Individual CLA and, if you agree, post the following comment exactly:

I have read the Baseline CLA and I hereby sign it

You only need to sign once — future PRs from the same GitHub account are auto-recognized.

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I have read the Baseline CLA and I hereby sign it

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Andrew Yang seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}