update installation docs to include metro config (#447)

Author: gabimoncha

packages/audiodocs/docs/fundamentals/getting-started.mdx

@@ -13,7 +13,7 @@ The goal of _Fundamentals_ is to guide you through the setup process of the Audi
 
 It takes only a few steps to add Audio API to your project:
 
-### Install the package
+### Step 1: Install the package
 
 Install the `react-native-audio-api` package from npm:
 
@@ -35,6 +35,23 @@ Install the `react-native-audio-api` package from npm:
   </TabItem>
 </Tabs>
 
+### Step 2: Wrap metro config with Audio API wrapper
+
+Wrap your existing Metro configuration in the `metro.config.js` file with the `wrapWithAudioAPIMetroConfig` function:
+
+```javascript
+// metro.config.js
+const {
+  wrapWithAudioAPIMetroConfig,
+} = require('react-native-audio-api/metro-config');
+
+const config = {
+  // Your existing Metro configuration options
+};
+
+module.exports = wrapWithAudioAPIMetroConfig(config);
+```
+
 ### Usage with expo
 
 `react-native-audio-api` contains native custom code and isn't part of the Expo Go application. In order to be available in expo managed builds, you have to use Expo development build. Simplest way on starting local expo dev builds, is to use: