Update README, add screenshot.

README.md

@@ -1,4 +1,23 @@
-# spatialnavigation
-Spatial Navigation Chrome Extension
+# Spatialnavigation
 
-This is based off the Spatial Navigation extension by Falsandtru (https://github.com/falsandtru/spatial-navigation)
+---
+
+__Spatial Navigation Chrome Extension__
+
+Smart spatial navigation with key map to links.
+
+This is based off the *Spatial Navigation* extension by 'Falsandtru':
+https://github.com/falsandtru/spatial-navigation
+
+Binds WASD, F, E and Q keys for navigation/hints.
+
+* __wasd__: Four-way spatial navigation
+* __e/E__: Cycle link hints
+* __q__: Exit navigation/hints mode
+* __f/Enter__: Click link
+* __Shift+Enter__: Shift-Click link
+* __Ctrl+Enter__: Ctrl-Click link
+
+![Screenshot of extension in use](https://raw.githubusercontent.com/Pathduck/spatialnavigation/main/img/screenshot.jpg "Screenshot of extension in use")
+
+Any contributions are most welcome! 🤓👍