Merge branch 'add-docs-gitattributes' into 7.4

Author: ezimuel

.gitattributes

@@ -13,3 +13,4 @@
 /ruleset.xml export-ignore
 /travis export-ignore
 /util export-ignore
+/docs export-ignore

README.md

@@ -3,13 +3,33 @@ elasticsearch-php
 
 [![Build Status](https://travis-ci.org/elastic/elasticsearch-php.svg?branch=master)](https://travis-ci.org/elastic/elasticsearch-php) [![Latest Stable Version](https://poser.pugx.org/elasticsearch/elasticsearch/v/stable)](https://packagist.org/packages/elasticsearch/elasticsearch) [![Total Downloads](https://poser.pugx.org/elasticsearch/elasticsearch/downloads)](https://packagist.org/packages/elasticsearch/elasticsearch)
 
-
 Official low-level client for Elasticsearch. Its goal is to provide common ground for all Elasticsearch-related code in PHP; because of this it tries to be opinion-free and very extendable.
 
 To maintain consistency across all the low-level clients (Ruby, Python, etc.), clients accept simple associative arrays as parameters.  All parameters, from the URI to the document body, are defined in the associative array.
 
 Starting from version 7.4.0, all the endpoints (and namespaces) are autogenerated using the [util/GenerateEndpoints.php](https://github.com/elastic/elasticsearch-php/blob/master/util/GenerateEndpoints.php) script. This script reads the [Elasticsearch API specs](https://github.com/elastic/elasticsearch/tree/master/rest-api-spec/src/main/resources/rest-api-spec/api) and generated the PHP classes for all the endpoints.
 
+Table of Contents
+=================
+
+- [elasticsearch-php](#elasticsearch-php)
+  * [Features](#features)
+  * [Version Matrix](#version-matrix)
+  * [Documentation](#documentation)
+  * [Installation via Composer](#installation-via-composer)
+  * [PHP Version Requirement](#php-version-requirement)
+  * [Quickstart](#quickstart)
+    + [Index a document](#index-a-document)
+    + [Get a document](#get-a-document)
+    + [Search for a document](#search-for-a-document)
+    + [Delete a document](#delete-a-document)
+    + [Delete an index](#delete-an-index)
+    + [Create an index](#create-an-index)
+- [Unit Testing using Mock a Elastic Client](#unit-testing-using-mock-a-elastic-client)
+- [Wrap up](#wrap-up)
+  * [Available Licenses](#available-licenses)
+    + [Contributions](#contributions)
+
 Features
 --------