feat(examples): add tailwind preset example

[jessicalynch]

Description of changes:

Adds example for building a Tailwind preset from tokens.

// demo/index.html

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[beejsbj]

An update on when this will be merged?

[jorenbroekema]

Hi, we're working hard on a v4 major release of style-dictionary, which already has some stable prereleases out there.
I'd love to give this a full review and merge this to the v4 branch if you're willing to rebase this to v4. We're putting v3 in maintenance mode which means we're only looking to merge important bugfixes or security vulnerabilities.

The changelog for v4 so far will be important to go over as there are some breaking changes to Style-Dictionary in v4 that affects your example.

[jessicalynch]

Thanks, that sounds great -- I will review the changelog and rebase to v4.