docs(cli): add crate level documentation

but I'm lazy

members/libpt-cli/src/lib.rs

@@ -1,3 +1,5 @@
+//! This module bundles a lot of good CLI tools, and adds some of it's own, to make development of
+//! CLI apps easier and more ergonomic.
 #![warn(clippy::pedantic, clippy::style, clippy::nursery)]
 pub mod args;
 pub mod printing;