Update readme to contain logo (ray-project#3443)

* Adding logo to readme

* Updating link

* Add badge

* Addressing comments

* Moving logo

* Change align

* Move image

README.rst

@@ -1,15 +1,19 @@
-Ray
-===
+.. raw:: html
+
+    <a href=http://ray.readthedocs.io/en/latest/index.html><img align="right" width="30%" src="https://github.com/devin-petersohn/ray/raw/docs/update_readme/doc/source/images/ray_logo.png"></a>
 
 .. image:: https://travis-ci.com/ray-project/ray.svg?branch=master
     :target: https://travis-ci.com/ray-project/ray
 
 .. image:: https://readthedocs.org/projects/ray/badge/?version=latest
     :target: http://ray.readthedocs.io/en/latest/?badge=latest
 
+.. image:: https://img.shields.io/badge/pypi-0.5.3-blue.svg
+    :target: https://pypi.org/project/ray/
+
 |
 
-Ray is a flexible, high-performance distributed execution framework.
+**Ray is a flexible, high-performance distributed execution framework.**
 
 
 Ray is easy to install: ``pip install ray``