Add badges

Added logo and badges

Author: kazoni

README.md

@@ -1,5 +1,12 @@
+![SendGrid Logo](https://uiux.s3.amazonaws.com/2016-logos/email-logo%402x.png)
+
 [![Travis Badge](https://travis-ci.org/sendgrid/php-http-client.svg?branch=master)](https://travis-ci.org/sendgrid/php-http-client)
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/sendgrid/php-http-client.svg?style=flat-square)](https://packagist.org/packages/sendgrid/php-http-client)
+[![Email Notifications Badge](https://dx.sendgrid.com/badge/php-http-client)](https://dx.sendgrid.com/newsletter/php-http-client)
+[![npm](https://img.shields.io/npm/l/express.svg)]()
+[![Twitter Follow](https://img.shields.io/twitter/follow/sendgrid.svg?style=social&label=Follow)](https://twitter.com/sendgrid)
+[![GitHub contributors](https://img.shields.io/github/contributors/sendgrid/php-http-client.svg)](https://github.com/sendgrid/php-http-client/graphs/contributors)
+
 
 **Quickly and easily access any RESTful or RESTful-like API.**