fix(react-native): add install steps (#5240)

Author: dbanksdesign

src/fragments/ui/react-native/installation.mdx

@@ -2,4 +2,10 @@
 
 ```
 yarn add aws-amplify aws-amplify-react-native @react-native-picker/picker
-```
+```
+
+If you are building for iOS you will need to install the CocoaPods:
+
+```
+npx pod-install
+```

src/pages/ui/auth/authenticator/q/framework/[framework].mdx

@@ -13,6 +13,10 @@ import developerpreviewjs from '/src/fragments/ui/auth/developer-preview-callout
 
 A simple way to add authentication flows into your app is to use the Authenticator component. The Authenticator component encapsulates an authentication workflow in the framework of your choice and is backed by the cloud resources set up in your Auth cloud resources.
 
+import react_native1 from '/src/fragments/ui/react-native/installation.mdx';
+
+<Fragments fragments={{ 'react-native': react_native1 }} />
+
 import react0 from "/src/fragments/ui/auth/web/authenticator.mdx";
 
 <Fragments fragments={{react: react0}} />