Add examples & tests

[srid]

Examples

• Single crate
• Multiple crate
• Multiple crate using glob in workspace.members (feat: glob support for workspace.members #34)
• Trunk (leptos CSR): https://crane.dev/examples/trunk.html

Tests

And make sure to test the following cases:

• feat!: Support multiple workspace crates #11
• chore(fix): Reintroduce checks #16

[srid]

See how we do this in haskell-flake and adopt that,

https://github.com/srid/haskell-flake

[Eliot00]

Can we have an example about cross compiling?