Added sleep timer script command (#985)

Author: AndriiBarabash

commands/system/sleep-timer.applescript

@@ -0,0 +1,22 @@
+#!/usr/bin/osascript
+
+# Required parameters:
+# @raycast.schemaVersion 1
+# @raycast.title Sleep Timer
+# @raycast.mode silent
+# @raycast.description Put your Mac to sleep (in X minutes).
+# @raycast.packageName System
+
+# Optional parameters:
+# @raycast.icon 😴
+# @raycast.argument1 { "optional": true, "type": "text", "placeholder": "(in) minutes" }
+
+# Documentation:
+# @raycast.author AndriiBarabash
+# @raycast.authorURL https://github.com/AndriiBarabash
+
+on run argv
+  delay (item 1 of argv) * 60
+  tell application "Finder" to sleep
+end run
+