docs: update usage section in README

README.md

@@ -1,13 +1,26 @@
 # i3 Switch Tabs
 Switch top-level tabs in i3-wm
 
-## Notes:
+## Notes
 
-Requires i3wm version 4.8 or newer.
+Requires i3-wm version 4.8 or newer.
 
-## Usage:
+## Usage
 
-Add this to i3 config:
+```
+Usage: i3-switch-tabs <DIRECTION>
+
+Arguments:
+  <DIRECTION>  Direction to switch to [possible values: left, right, down, up]
+
+Options:
+  -h, --help     Print help
+  -V, --version  Print version
+```
+
+### Example
+
+Add this to your i3-wm config:
 
 ```
 bindsym $mod+Tab exec i3-switch-tabs right