add storybook

.storybook/main.js

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+/** @type { import('@storybook/sveltekit').StorybookConfig } */
+const config = {
+  stories: ['../src/**/*.mdx', '../src/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
+  addons: [
+    '@storybook/addon-links',
+    '@storybook/addon-essentials',
+    '@storybook/addon-interactions',
+    '@storybook/addon-styling-webpack',
+    '@storybook/addon-interactions',
+    '@storybook/addon-viewport',
+  ],
+  framework: {
+    name: '@storybook/sveltekit',
+    options: {},
+  },
+  docs: {
+    autodocs: 'tag',
+  },
+};
+export default config;

.storybook/preview.js

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+import '../src/app.css'; // replace with the name of your tailwind css file
+
+/** @type { import('@storybook/svelte').Preview } */
+const preview = {
+  parameters: {
+    actions: {argTypesRegex: '^on[A-Z].*'},
+    controls: {
+      matchers: {
+        color: /(background|color)$/i,
+        date: /Date$/i,
+      },
+    },
+  },
+};
+
+export default preview;