update README

Author: Joel Butcher

README.md

@@ -1,5 +1,39 @@
 # Laravel Facebook Graph SDK
 
+## Installation
+
+Getting started with Laravel Facebook Graph is easy - first, install the package via composer
+
+```
+composer require joelbutcher/laravel-facebook-graph
+```
+
+Then publish the package config:
+
+```
+php artisan vendor:publish --provider="JoelButcher\Facebook\FacebookServiceProvider"
+```
+
+This will add a `config/facebook.php` file to your project. Here you may configure the following options:
+
+| Option  | Description |
+| ------- | ------------- |
+| `app_id` | Used to identify your app when requesting a users' access token |
+| `app_secret` | The secret key used to authorize your app with Facebook |
+| `redirect_url` | The destination URL to redirect users to, after authenticating with Facebook |
+| `graph_version` | The graph version to target when making user-authenticated requests to the Facebook Graph API, defaults to v11.0 |
+| `beta_mode` | Indicates whether or not to run a beta version of the SDK |
+
+## URL Detection Handler
+You may add a custom URL Detection handler, by binding a singleton your implementation in the `register` method of the `AppServiceProvider`:
+
+```php
+$this->app->singleton(UrlDetectionInterface::class, fn ($app) => $app[UrlDetectionHandler::class])
+```
+
 ## Persistent Data Handlers
 
 In order to store the `state` for OAuth requests to Facebook, you will either need to register a persistent data handler. You can find an example of how to do this [here](./docs/examples/persistent_data_storage.md)
+
+## HTTP Client
+The current version of the Facebook Graph SDK (v6) uses [HTTPlug](http://httplug.io/) for making requests. If you wish to use your own HTTP Client, it MUST implment the `Http\Client\HttpClient` interface. Please refer to [this example](./docs/examples/http_client.md)