chore: Create readme file to help with building and running sample ap…

…ps (#370)

Apps/README.md

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+# Running the sample apps
+
+You can use the following steps to run any of our sample apps.
+
+## Build the SDK
+
+At the root directory of this repository run the following command to build the SDK:
+
+```bash
+npm install
+```
+
+## Connect the app to a workspace in Customer.io
+
+- Depending on which sample app you want to test, navigate to the directory of that sample app using either of these commands: `cd Apps/APN/` or `cd Apps/FCM`
+- Make a copy of `env.sample.js` by running `cp env.sample.js env.js` at sample app root directory
+- Make a copy of `Env.swift.example` by running `cp Env.swift.example Env.swift` at sample app `ios` directory (`Apps/APN/ios` or `Apps/FCM/ios`)
+- Update env.js with your `siteId` and `cdpApiKey`
+
+## Build one of the sample apps
+
+Depending on which sample app you want to test, navigate to the directory of that sample app using either of these commands:
+
+`cd Apps/APN/` or `cd Apps/FCM`
+
+Then run the following commands:
+
+```bash
+npm run preinstall
+npm install
+```
+
+## Run the sample app
+
+After you have built the app you can then now run it on Android or iOS using any of these commands:
+
+To run Android:
+
+```bash
+npx react-native run-android
+```
+
+To run iOS:
+
+```bash
+npx react-native run-ios
+```