docs: create readme

Author: pacexy

README.md

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+# Tailwindcss Variable Colors
+
+Add dark mode support with just one class
+
+## Demo
+
+<https://tailwindcss-variable-colors.vercel.app/>
+
+## Install
+
+```sh
+pnpm i -D tailwindcss-variable-colors
+```
+
+## Usage
+
+```ts
+// tailwind.config.ts
+import { Config } from 'tailwindcss'
+import colors from 'tailwindcss/colors'
+import { createVariableColors, variableColorsPlugin } from './src'
+
+const config: Config = {
+  content: ['./src/**/*.tsx'],
+  theme: {
+    colors: createVariableColors(colors),
+  },
+  plugins: [variableColorsPlugin(colors)],
+}
+
+export default config
+```
+
+## License
+
+MIT