add spyglass cask

Casks/spyglass.rb

@@ -0,0 +1,15 @@
+cask "spyglass" do
+  version "2022.7.1"
+  sha256 "2439251758d3b0c664c16e214663f4ceeb16ffa92c2bcc0c8393e0bac119a949"
+
+  # The tag name includes the full year, but the download URL elides the first two digits
+  url "https://github.com/a5huynh/spyglass/releases/download/v#{version}/Spyglass_#{version.sub(/^20/, "")}_x64.dmg"
+  name "Spyglass"
+  desc "A personal search engine that indexes what you want, exposing it to you in a simple & fast interface"
+  homepage "https://github.com/a5huynh/spyglass"
+
+  app "Spyglass.app"
+
+  # livecheck do
+  # end
+end