Recommend pod-install for setup instructions

We've been recommending devs use `npx pod-install` since it will attempt to install CocoaPods CLI if it's not available on the computer (cite [React Navigation setup guide](https://reactnavigation.org/docs/getting-started/#installing-dependencies-into-a-bare-react-native-project)). This has proved very useful for Expo users who are now migrating to the bare workflow and want to use community packages in their projects.

## Checklist

- [x] I have tested this on a device and a simulator
- [x] I added the documentation in `README.md`

Author: EvanBacon

README.md

@@ -18,6 +18,10 @@ or
 
 `npm install @react-native-community/image-editor --save`
 
+### Install Pods
+
+`npx pod-install`
+
 ### Link
 
 `react-native link @react-native-community/image-editor`