Add an indicator for whether or not a crate is available on the playground.

[RpxdYTX]

Something like a "Test on Playground" with a link to a sample hello world with the use isn't bad. This will make clearer which crates are or aren't usable on the playground, just a little utility tweak.

[Turbo87]

I'm not sure I understand what you're suggesting. We already have such a button for the crates that are supported by the playground 🤔

[RpxdYTX]

Nvm