No documentation about rust-si

[vi]

Maybe also update repository name to be text_io (or something like rust-text-io) instead of rust-si?

Repository description is also too short. It should include something like "scanf" or "reverse of format! or print!". Also it is primarily parsing functions, not input functions.

[oli-obk]

updated the repository readme, will also add documentation on the macro directly

[alexreg]

+1 to @vi's comment, on all points.

[pickfire]

The readme have documentation now, but when I view the offline documentation, it doesn't have any usage on scan! macro, sometimes I happen to do stuff offline then I have no idea how to use it, maybe copy what is shown in readme to the lib.rs? Or put it inside scan! documentation?