Update README.md

Update usage info

README.md

@@ -1,2 +1,13 @@
 # swayswitch
 A simple windowswitcher written in python using wxPython
+
+## Usage
+```
+wget -O https://github.com/mickenordin/swayswitch/blob/main/swayswitch https://github.com/mickenordin/swayswitch/blob/main/swayswitch
+```
+Add a keybinding to ~/.config/sway/config:
+
+```
+bindsym $mod+Tab exec ~/.local/bin/swayswitch
+```
+Reload config and open up window switcher with $mod+tab.