docs: add docs for the deployment capabilities (#2056)

Author: mgechev

docs/deploy/getting-started.md

@@ -0,0 +1,66 @@
+# Deployment with the Angular CLI
+
+In this guide, we'll look at how to use `@angular/fire` to automatically deploy an Angular application to Firebase hosting by using the Angular CLI.
+
+## Step 1: add `@angular/fire` to your project
+
+First, you need to add the `@angular/fire` package to your project. In your Angular CLI project run:
+
+```shell
+ng add @angular/fire
+```
+
+*Note that the command above assumes you have global Angular CLI installed. To install Angular CLI globally run `npm i -g @angular/cli`.*
+
+The command above will trigger the `@angular/fire` `ng-add` schematics. Once they install `@angular/fire`. If you are not authenticated, the schematics will open a browser which will guide you through the authentication flow. Once you authenticate, you'll see a prompt to select a Firebase hosting project.
+
+The schematics will do the following:
+
+- Add `@angular/fire` to your list of dependencies
+- Create `firebase.json`, `.firebaserc` files in the root of your workspace. You can use them to configure your firebase hosting deployment. Find more about them [here](https://firebase.google.com/docs/hosting/full-config)
+- Update your workspace file (`angular.json`) by inserting the `deploy` builder
+
+In the end, your `angular.json` project will look like below:
+
+```json
+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "newProjectRoot": "projects",
+  "projects": {
+    "sample-app": {
+        // ...
+        "deploy": {
+          "builder": "@angular/fire:deploy",
+          "options": {}
+        }
+      }
+    }
+    // ...
+  },
+  "defaultProject": "sample-app"
+}
+```
+
+If you want to add deployment capabilities to a different project in your workspace, you can run:
+
+```
+ng add @angular/fire --project=[PROJECT_NAME]
+```
+
+## Step 2: deploying the project
+
+As the second step, to deploy your project run:
+
+```
+ng run [PROJECT_NAME]:deploy
+```
+
+The command above will trigger:
+
+1. Production build of your application
+2. Deployment of the produced assets to the firebase hosting project you selected during `ng add`
+
+## Step 3: customization
+
+To customize the deployment flow, you can use the configuration files you're already familiar with from `firebase-tools`. You can find more in the [firebase documentation](https://firebase.google.com/docs/hosting/full-config).