Add FizzBee to starlark users list

[jayaprabhakar]

FizzBee is a system design language that enables mainstream software engineers to automatically verify distributed system designs for cloud, micro-services, and event-driven applications.

FizzBee uses Starlark to provide an intuitive, Python-like specification language, unlike other formal languages that rely on complex mathematical syntax.

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[jayaprabhakar]

@tetromino @stepancheg @meisterT If you don't mind can you talk a look?

[brandjon]

Hi, we're using Laurent's awesome-starlark list in lieu of maintaining a list of usages in this repository now. (I see you've already been added there.) Sorry to keep this PR open so long.