Rust kudubot bindings

These are binding/helper functions for writing an external kudubot Service.

To integrate the bindings in your project, add the following line to the [dependencies] section of your Cargo.toml file:

kudubot-bindings = "VERSION"

Replace Version with the version of your choice, or just * for the newest version.

For an instruction on how to write Services in Rust, have a look at the parent project: kudubot