Add minimal example projects for testing

[cbourjau]

It would be great to add some minimal example projects to this repository on which we could run CI as well as work to figure out some corner cases. Project configurations which come to mind are:

• Simple binary (cargo new --bin mybin)
• Simple library (cargo new --lib mylib)
• Library with one binary
• Library with several binaries
• Library with examples to be run with cargo run --example myexample
• Library with benchmarks (would be very helpful for Does not work with cargo bench #9 )
• Project with a workspace, libraries, and binaries

There are probably more...