Improved messages to make intention of creating different apps for di… (microsoft#406)

* Improved messages to make intention of creating different apps for different platforms more clear

Due to multiple requests in discord chanel, microsoft/react-native-code-push#723, microsoft/react-native-code-push#717

* Minor tweak for readme

Author: max-mironov

cli/README.md

@@ -147,7 +147,7 @@ Before you can deploy any updates, you need to register an app with the CodePush
 code-push app add <appName>
 ```
 
-If your app targets both iOS and Android, we highly recommend creating separate apps with CodePush. One for each platform. This way, you can manage and release updates to them separately, which in the long run, tends to make things simpler. The naming convention that most folks use is to suffix the app name with `-iOS` and `-Android`. For example:
+If your app targets both iOS and Android, please *create separate apps for each platform* with CodePush (see the note below for details). This way, you can manage and release updates to them separately, which in the long run, also tends to make things simpler. The naming convention that most folks use is to suffix the app name with `-iOS` and `-Android`. For example:
 
 ```
 code-push app add MyApp-Android