better 'how to run the demo' doc

Author: EddyVerbruggen

README.md

@@ -86,7 +86,10 @@ project.ext {
 ## Usage
 
 ### Demo app
-If you want a quickstart, clone the repo, `cd src`, and `npm run demo.ios` or `npm run demo.android`.
+If you want a quickstart, clone the repo, then:
+- `cd src`.
+- `npm i` (just answer 'n' to any prompts as they are ignored anyway).
+- `npm run demo.ios` or `npm run demo.android` (answer 'n' again if prompted).
 
 ### Start-up wiring
 We need to do some wiring when your app starts, so open `app.js` and add this before `application.start();`:
@@ -294,4 +297,4 @@ The after-prepare hook of this plugin will now choose either the `dev` or the `p
 * `prod` will be selected if you run with either the `--release`, `--env.prod` or `--env.production` flags
 * `dev` will be selected if you do not run with the above flags
 
-Note: if you do not have both `dev` and `prod` files in place, the regular `GoogleService-Info.plist` and `google-services.json` files will be used.
+Note: if you do not have both `dev` and `prod` files in place, the regular `GoogleService-Info.plist` and `google-services.json` files will be used.