add tailwind

- add build-tailwind.sh
- add build-tailwind.bat
- add tailwind.config.js
- add layout.html

tailwindcss/tailwind.config.js

@@ -0,0 +1,9 @@
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  content: [
+    "./src/main/resources/templates/**/*.html",
+    "./src/main/resources/static/js/**/*.js"
+  ],
+  theme: { extend: {} },
+  plugins: [],
+}