Add meta-data for FSharp/Fable Starter

[jbeeko]

This PR adds a meta-data file for a FSharp/Fable language starter.

[koeninger]

Thanks for this!

We recently reorganized our docs into https://github.com/cloudflare/cloudflare-docs/ , can you open a PR over there instead? Here's an example: https://github.com/cloudflare/cloudflare-docs/pull/52/files

I also noticed that the readme says

wrangler generate projectname https://github.com/fable-compiler/fable-cfworker

(singular), but the repos seem to be https://github.com/fable-compiler/fable-cfworkers (plural) and https://github.com/fable-compiler/cfworker-hello-world

[jbeeko]

I've clarified plural not plural and moved this to https://github.com/cloudflare/cloudflare-docs/compare/master...jbeeko:patch-1