message: docs: add install Firebase CLI step before using its commands
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diff: @@ -63,6 +63,7 @@ One of the easiest ways to get your site live is to host it using Firebase.
  1. Sign up for a firebase account on [Firebase](https://firebase.google.com/ "Firebase web site").
  1. Create a new project, giving it any name you like.
  1. Add the `@angular/fire` schematics that will handle your deployment using `ng add @angular/fire`.
  +1. Install [Firebase CLI](https://firebase.google.com/docs/cli) globally using `npm install -g firebase-tools`.
  1. Connect your CLI to your Firebase account and initialize the connection to your project using `firebase login` and `firebase init`.
  1. Follow the prompts to select the `Firebase` project you are creating for hosting.
  - Select the `Hosting` option on the first prompt.
  