Update README.md

README.md

@@ -4,11 +4,15 @@
 
 ## Getting started
 
-`$ npm install react-native-web-webview --save`
+Installing
+```
+npm install react-native-web-webview --save
+```
 
-Alias the package in your webpack config:
+The package provides the same functionality as react-native-webview, however, it works when exported as a web project.
+To continue using the same imports that you do with non-web exports, you you configure an alias in your webpack config so that it resolves to the correct package.
 
-```
+```js
 resolve: {
     alias: {
         'react-native': 'react-native-web',
@@ -32,6 +36,60 @@ const rule = {
 };
 ```
 
+## With Expo
+When using Expo, you will need to add a webpack file that will be used for web builds in order to add the above code.
+The following command will create the file in the way expected by Expo and will also install the **@expo/webpack-config** dependency which is necessary.
+```$
+npx expo customize webpack.config.js
+```
+
+If you haven't set up Expo to export web projects at all, you will need to install the following dependencies.
+```
+npx expo install react-native-web react-dom
+```
+
+Below is an example implementation of **webpack.config.js** in an expo project.
+```js
+const createExpoWebpackConfigAsync = require('@expo/webpack-config');
+
+
+///////
+// NOTE: Webpack is only used for bundling web
+///////
+
+
+module.exports = async function (env, argv) {  
+  const config = await createExpoWebpackConfigAsync(env, argv);
+
+  config.resolve.alias = {
+    ...config.resolve.alias,
+
+    // Set up aliases so the web versions are used (Rather than changing imports in each file)
+    'react-native': 'react-native-web',
+    'react-native-webview': 'react-native-web-webview',
+
+  };
+
+  // Prevents an error the react-native-web-webview recieves when building
+  const rule = {
+    test: /postMock.html$/,
+    use: {
+      loader: 'file-loader',
+      options: {
+        name: '[name].[ext]',
+      },
+    },
+  };
+  config.module.rules.push(rule);
+
+
+  // Return the config for use by webpack
+  return config;
+};
+
+```
+
+
 ## Usage
 
 ```js