add xkcd support

Signed-off-by: siddontang <siddontang@gmail.com>

xkcdsay.rb

@@ -0,0 +1,17 @@
+class Xkcdsay < Formula
+  desc "View the XKCD comics in the terminal"
+  homepage "https://github.com/siddontang/xkcdsay"
+  url "https://github.com/siddontang/xkcdsay/archive/refs/tags/v0.1.tar.gz"
+  sha256 "8152e2a55b0c8dba6a244d491d779fdb270389ef2228fc9670b2c08106ba6c34"
+  license "MIT"
+
+  depends_on "go" => :build
+
+  def install
+    system "go", "build", "-o", bin/"xkcdsay", "./cmd/xkcdsay/."
+  end
+
+  test do
+    system "#{bin}/xkcdsay"
+  end
+end