Update Readme.md

Readme.md

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 Swiftmouse is a tool to quickly navigate your screen using only a keyboard. It is inspired by the shortcat app for mac and works by utilizing xdg desktop portal apis, so it works on wayland.
 
 https://github.com/quexten/swiftmouse/assets/11866552/4fe3c589-a4e5-4766-8f69-4831705292e5
+
+### Usage
+
+```
+swiftmouse {left/right/middle/double}
+```
+
+will take a screenshot, use image processing to detect ui elements, and show a ui in fullscreen. You can either enter 2 letters from a label to click on that position, or hit escape to cancel.
+If you want to bind swiftmouse to a shortcut please use whatever facilities your desktop environment provides. Dual screen system are not supported at them moment.