Add brew installation about widgettoggler HOT 1 OPEN

I created a cask and confirmed that it's working and passes brew audit --cask --new widgettoggler.

Casks/widgettoggler.rb:

cask "widgettoggler" do
  version "1.2.0"
  sha256 "4a37bd84eb391c86e80a05b3b875dae6286418f2223970dbeff03abe310b5af9"

  url "https://github.com/sieren/WidgetToggler/releases/download/#{version}/WidgetToggler_#{version.split(".")[0...2].join(".")}.zip"
  name "widgettoggler"
  desc "macOS Sonoma Widget Toggler for the Tray Bar - Easily Show and Hide Widgets"
  homepage "https://github.com/sieren/WidgetToggler"

  depends_on macos: ">= :sonoma"

  app "WidgetToggler.app"
end

I didn't add the recommended brew livecheck stanza because I'm not familiar with the syntax yet, but it's not required.

Can someone submit this? It can be submitted this way:

• You can submit this file to Homebrew/homebrew-cask. This will let users install it via brew install widgettoggler. Anyone can submit this file, I just don't have the time to do it.

• Alternatively, the maintainer can create a new repo sieren/homebrew-widgettoggler and put this file into it. This will let users install it via brew install sieren/widgettoggler/widgettoggler.

from widgettoggler.