Add Sparkplate.app v1.0.0

This is the initial PR for submitting the Sparkplate.app.
A zap stanza was added for cleaning up preferences files when uninstalling the app

Casks/s/sparkplate.rb

@@ -0,0 +1,21 @@
+cask "sparkplate" do
+  version "1.0.0"
+  sha256 "f9bff9256c4c95bf1a53b9c074e6a3f44d35e75043a404f306c1bd09121e93e7"
+
+  url "https://github.com/GreenfireInc/homebrew-sparkplate/releases/download/v#{version}/Sparkplate.zip"
+  name "sparkplate"
+  desc "Features a test page for resolving human readable domains to crypto addresses"
+  homepage "https://github.com/GreenfireInc/Sparkplate.Vue"
+
+  app "Sparkplate.app"
+
+  zap trash: [
+    "~/Library/Application Support/sparkplate",
+    "~/Library/Preferences/com.sparkplate.app.plist",
+    "~/Library/Preferences/io.greenfire.sparkplate-.plist",
+    "~/Library/Preferences/io.greenfire.sparkplate.helper.plist",
+    "~/Library/Preferences/io.greenfire.sparkplate.plist",
+    "~/Library/Saved Application State/com.sparkplate.app.savedState",
+    "~/Library/Saved Application State/io.greenfire.sparkplate.savedState",
+  ]
+end