make keyboard layout switchable

.config/sway/config

@@ -123,6 +123,12 @@ bar {
     swaybar_command waybar
 }
 
+# switch keyboard layouts with right ctrl key
+input type:keyboard {
+    xkb_layout us,de
+    xkb_options grp:rctrl_toggle
+}
+
 input type:touchpad {
     tap enabled
     natural_scroll enabled