docs: update readme for nextjs and webpack plugin

packages/nextjs-plugin/README.md

@@ -1,3 +1,49 @@
 # @stylexjs/nextjs-plugin
 
-...
+## Documentation Website
+[https://stylexjs.com](https://stylexjs.com)
+
+## Installation
+
+Install the package by using:
+```bash
+npm install --save-dev @stylexjs/nextjs-plugin
+```
+
+or with yarn:
+
+```bash
+yarn add --dev @stylexjs/nextjs-plugin
+```
+
+> :warning: `@/` alias is unsupported at the moment.
+
+Add the following to your `.babelrc.js`
+```javascript
+module.exports = {
+  presets: ['next/babel'],
+  plugins: [
+    [
+      '@stylexjs/babel-plugin',
+      {
+        dev: process.env.NODE_ENV === 'development',
+        runtimeInjection: false,
+        genConditionalClasses: true,
+        unstable_moduleResolution: {
+          type: 'commonJS',
+          rootDir: __dirname,
+        },
+      },
+    ],
+  ],
+};
+```
+
+Add the following to your `next.config.js`
+```javascript
+const stylexPlugin = require('@stylexjs/nextjs-plugin');
+
+module.exports = stylexPlugin({
+  rootDir: __dirname,
+})({});
+```

packages/webpack-plugin/README.md

@@ -1,3 +1,67 @@
 # @stylexjs/webpack-plugin
 
-...
+
+## Documentation Website
+[https://stylexjs.com](https://stylexjs.com)
+
+## Installation
+
+Install the package by using:
+```bash
+npm install --save-dev @stylexjs/webpack-plugin
+```
+
+or with yarn:
+
+```bash
+yarn add --dev @stylexjs/webpack-plugin
+```
+
+Add the following to your `webpack.config.js`
+```javascript
+const StylexPlugin = require('@stylexjs/webpack-plugin');
+const path = require('path');
+
+const config = (env, argv) => ({
+  entry: {
+    main: './src/index.js',
+  },
+  output: {
+    path: path.resolve(__dirname, '.build'),
+    filename: '[name].js',
+  },
+  module: {
+    rules: [
+      {
+        test: /\.js$/,
+        exclude: /node_modules/,
+        use: 'babel-loader',
+      },
+    ],
+  },
+  plugins: [
+    // Ensure that the stylex plugin is used before Babel
+    new StylexPlugin({
+      filename: 'styles.[contenthash].css',
+      // get webpack mode and set value for dev
+      dev: argv.mode === 'development',
+      // Use statically generated CSS files and not runtime injected CSS.
+      // Even in development.
+      runtimeInjection: false,
+      // optional. default: 'x'
+      classNamePrefix: 'x',
+      // Required for CSS variable support
+      unstable_moduleResolution: {
+        // type: 'commonJS' | 'haste'
+        // default: 'commonJS'
+        type: 'commonJS',
+        // The absolute path to the root directory of your project
+        rootDir: __dirname,
+      },
+    }),
+  ],
+  cache: true,
+});
+
+module.exports = config;
+```