chore(hammerspoon): add configuration

https://github.com/Hammerspoon/hammerspoon

hammerspoon/caffeine.lua

@@ -0,0 +1,20 @@
+-- Replace Caffeine.app with 18 lines of Lua :D
+local caffeine = hs.menubar.new()
+
+function setCaffeineDisplay(state)
+  local result
+  if state then
+    result = caffeine:setIcon("~/.hammerspoon/icons/sun.pdf")
+  else
+    result = caffeine:setIcon("~/.hammerspoon/icons/moon.pdf")
+  end
+end
+
+function caffeineClicked()
+  setCaffeineDisplay(hs.caffeinate.toggle("displayIdle"))
+end
+
+if caffeine then
+  caffeine:setClickCallback(caffeineClicked)
+  setCaffeineDisplay(hs.caffeinate.get("displayIdle"))
+end