Add TailwindCSS default config file

tailwind.config.js

@@ -0,0 +1,16 @@
+module.exports = ({ dev, rootDir, srcDir }) => ({
+  theme: {},
+  variants: {},
+  plugins: [],
+  purge: {
+    // Learn more on https://tailwindcss.com/docs/controlling-file-size/#removing-unused-css
+    enabled: !dev,
+    content: [
+      `${srcDir}/components/**/*.{vue,js}`,
+      `${srcDir}/layouts/**/*.vue`,
+      `${srcDir}/pages/**/*.vue`,
+      `${srcDir}/plugins/**/*.{js,ts}`,
+      `${rootDir}/nuxt.config.{js,ts}`
+    ]
+  }
+});