Add homebrew tap and cask for Syntax Highlight.

It seems like [Homebrew](https://github.com/orgs/Homebrew/discussions/6482) doesn't want [unsigned casks](https://github.com/Homebrew/homebrew-cask/blob/HEAD/Casks/s/syntax-highlight.rb#L21) in official taps, so adding to personal tap.

Author: seivan

Casks/syntax-highlight.rb

@@ -0,0 +1,38 @@
+cask "syntax-highlight" do
+  version "2.1.27"
+  sha256 "c902ef7d1422f43b97ae1352220d7feaafd6aceac29460a51c32bb3d8e15daeb"
+
+  url "https://github.com/sbarex/SourceCodeSyntaxHighlight/releases/download/#{version}/Syntax.Highlight.zip"
+  name "Syntax Highlight"
+  desc "Quicklook extension for source files"
+  homepage "https://github.com/sbarex/SourceCodeSyntaxHighlight"
+
+  livecheck do
+    url "https://sbarex.github.io/SourceCodeSyntaxHighlight/appcast.xml"
+    strategy :sparkle do |items|
+      items.map(&:short_version)
+    end
+  end
+
+  auto_updates true
+  depends_on macos: ">= :big_sur"
+
+  app "Syntax Highlight.app"
+  binary "#{appdir}/Syntax Highlight.app/Contents/Resources/syntax_highlight_cli"
+
+  postflight do
+    system_command "/usr/bin/xattr",
+                   args: ["-r", "-d", "com.apple.quarantine", "#{appdir}/Syntax Highlight.app"],
+                   sudo: true
+  end
+
+  zap trash: [
+    "~/Library/Application Scripts/org.sbarex.SourceCodeSyntaxHighlight",
+    "~/Library/Application Scripts/org.sbarex.SourceCodeSyntaxHighlight.QuicklookExtension",
+    "~/Library/Application Support/Syntax Highlight",
+    "~/Library/Caches/com.apple.helpd/Generated/org.sbarex.SourceCodeSyntaxHighlight.help*",
+    "~/Library/Containers/org.sbarex.SourceCodeSyntaxHighlight",
+    "~/Library/Containers/org.sbarex.SourceCodeSyntaxHighlight.QuicklookExtension",
+    "~/Library/Preferences/org.sbarex.SourceCodeSyntaxHighlight.plist",
+  ]
+end