Add Sphinx doc

docs/index.md

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+# Overview
+
+Automatically generate your API documentation from your existing Laravel/Lumen/[Dingo](https://github.com/dingo/api) routes. [Here's what the output looks like](http://marcelpociot.de/whiteboard/).
+
+`php artisan apidoc:generate`
+
+## Contents
+* [Configuration](config.md)
+* [Generating Documentation](generating-documentation.md)
+* [Documenting Your API](documenting.md)
+
+## Installation
+> Note: PHP 7 and Laravel 5.5 or higher are required.
+
+```sh
+composer require mpociot/laravel-apidoc-generator
+```
+
+### Laravel
+Publish the config file by running:
+
+```bash
+php artisan vendor:publish --provider="Mpociot\ApiDoc\ApiDocGeneratorServiceProvider" --tag=apidoc-config
+```
+This will create an `apidoc.php` file in your `config` folder.
+
+### Lumen
+- Register the service provider in your `bootstrap/app.php`:
+
+```php
+$app->register(\Mpociot\ApiDoc\ApiDocGeneratorServiceProvider::class);
+```
+
+- Copy the config file from `vendor/mpociot/laravel-apidoc-generator/config/apidoc.php` to your project as `config/apidoc.php`. Then add to your `bootstrap/app.php`:
+
+```php
+$app->configure('apidoc');
+```