docs: add more installation instructions

Author: Hugo Vieilledent

README.md

@@ -16,7 +16,6 @@ $ cat tmp/deploy-dist/index.json
   "robots.txt": "robots.txt"
 }
 ```
-
 ## What is an Ember CLI Deploy plugin?
 
 A plugin is an addon that can be executed as a part of the Ember CLI Deploy pipeline. A plugin will implement one or more of the Ember CLI Deploy's pipeline hooks.
@@ -25,17 +24,38 @@ For more information on what plugins are and how they work, please refer to the
 
 ## Setup
 
-- Requirements
+### Requirements
+
+You'll first have to install and configure :
 
-You'll first have to [setup `ember-cli-deploy-s3-index`](https://github.com/ember-cli-deploy/ember-cli-deploy-s3-index#quick-start).
+- [`ember-cli-deploy`](https://github.com/ember-cli-deploy/ember-cli-deploy)
+- [`ember-cli-deploy-index-json`](https://github.com/peopledoc/ember-cli-deploy-index-json
+- [`ember-cli-deploy-s3-index`](https://github.com/ember-cli-deploy/ember-cli-deploy-s3-index#quick-start).)
+- [ember-cli-deploy-build](https://github.com/ember-cli-deploy/ember-cli-deploy-build)
+- [ember-cli-deploy-revision-data](https://github.com/ember-cli-deploy/ember-cli-deploy-revision-data)
+- [ember-cli-deploy-display-revisions](https://github.com/duizendnegen/ember-cli-deploy-display-revisions) 
 
-- Install this plugin
+You can do this like so:
+
+``` shell
+ember install ember-cli-deploy // ↶ requires
+ember install ember-cli-deploy-s3-index //  ↶ requires:
+ember install ember-cli-deploy-s3
+ember install ember-cli-deploy-build
+ember install ember-cli-deploy-revision-data
+ember install ember-cli-deploy-display-revisions
+```
+
+### Install this plugin
 
 ```bash
 $ ember install ember-cli-deploy-index-json
 ```
 
-- Configuration
+### Configuration
+
+When `ember install ember-cli-deploy` was run, it should have
+generated a a file at `your-app/config/deploy.js`.
 
 Edit `config/deploy.js` so that your configuration looks like the snippet below.
 
@@ -49,7 +69,61 @@ s3: {},
 }
 ```
 
-*In depth:* The idea is that `revision-data`, `s3-index` and `index-json` have the same `filePattern` value. `index-json` is not present in this example because we're using its default `filePattern` value.
+*In depth:* The idea is that `revision-data`, `s3-index` and
+`index-json` have the same `filePattern` value. `index-json` is not
+present in this example because we're using its default `filePattern` value. More on this in the Ember CLI Deploy plugin section.
+
+Here is a full example of this file, getting the Amazon S3 information
+from unix environement variables.
+
+``` js
+/* eslint-env node */
+'use strict';
+
+module.exports = function(deployTarget) {
+  let ENV = {
+    s3: {},
+    'revision-data': {
+      filePattern: 'index.json'
+    },
+    's3-index': {
+      filePattern: 'index.json'
+    },
+    build: {}
+  };
+
+  if (deployTarget === 'development') {
+    ENV.build.environment = 'development';
+    // configure other plugins for development deploy target here
+  }
+
+  if (deployTarget === 'staging') {
+    ENV.build.environment = 'production';
+    // configure other plugins for staging deploy target here
+  }
+
+  if (deployTarget === 'production') {
+    ENV.build.environment = 'production';
+    // configure other plugins for production deploy target here
+    let s3Config = {
+      allowOverwrite: process.env.ALLOW_OVERWRITE === 'true' ? true : false,
+      signatureVersion: 'v4',
+      accessKeyId: process.env.AWS_ACCESS_KEY_ID,
+      secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY,
+      bucket: process.env.S3_BUCKET_URI,
+      region: process.env.S3_REGION
+    };
+
+    Object.assign(ENV.s3, s3Config);
+    Object.assign(ENV['s3-index'], s3Config);
+  }
+
+  // Note: if you need to build some configuration asynchronously, you can return
+  // a promise that resolves with the ENV object instead of returning the
+  // ENV object synchronously.
+  return ENV;
+};
+```
 
 ## Usage