Keats is a mode for storing notes about Emacs key bindings so you easier remember them.
Keats is really two modes. One major and one minor. Read below for more information.
This is the minor mode and can control the keats with keybindings without opening another buffer.
Add keats to Emacs load-path (add-to-list 'load-path "/path/to/directory/or/file")
Then require keats (require 'keats)
The major mode opens a buffer with keats. This mode is easier to work with, specially if you want to add, edit or remove many keats.
Require the interactive mode (requires the above) (require 'keats-interactive)