add example readme

Author: uddish

example/README.md

@@ -0,0 +1,46 @@
+# Welcome to @intercom/intercom-react-native example app 👋
+
+## Installation
+
+To get started with the @intercom/intercom-react-native example app, please follow the instructions below:
+
+1. Generate a new .env file by running the following command in your terminal:
+```sh
+sh scripts/generateEnv.sh
+```
+
+This command will create a .env file inside the example directory.
+
+1. Fill in the required Android and iOS API keys and workspace IDs in the .env file. Other variables are optional.
+
+2. Install the dependencies by running the following command in the project directory:
+
+```sh
+yarn
+```
+
+### Android
+
+To run the app on Android, execute the following command:
+
+
+```sh
+yarn example android --variant=fossDebug
+```
+
+### iOS
+For iOS, you need to install the necessary pods. Go to the example/ios directory in your terminal and run:
+
+```sh
+cd example/ios
+pod install
+```
+
+Once the pods are installed, go back to the project's root directory and execute the following command to run the app on iOS:
+
+```sh
+yarn example ios
+```
+
+### Notes:
+Please note that there is a known bug that prevents the iOS app from building on the latest Xcode. Therefore, it's recommended to use Xcode 14.2.