Updated instructions

README.md

 
 To run the Spring Boot backend, cd into `server` and run `mvn spring-boot:run`.
 
-In another terminal, cd into `client` and execute `npm install && ionic serve`. The aforementioned blog post shows you how to deploy this app to an emulator/device. 
+In another terminal window, install Ionic and Cordova.
+
+```
+npm install -g ionic cordova
+```
+
+Next, cd into `client` and execute `npm install && ionic serve`. The aforementioned blog post shows you how to deploy this app to an emulator/device.