Add CITATION.rst and release info.

Author: drvinceknight

CITATION.rst

@@ -11,5 +11,5 @@ Please use the following to cite the latest version of the Ciw library::
 To check the details (RELEASE TITLE, YEAR, DOI INFORMATION and DOI NUMBER)
 please view the Zenodo page for the project. Click on the badge/link below:
 
-.. image:: https://zenodo.org/badge/19509/Axelrod-Python/Axelrod.svg
-    :target: https://zenodo.org/badge/latestdoi/19509/Axelrod-Python/Axelrod
+.. image:: https://zenodo.org/badge/47995577.svg
+	:target: https://zenodo.org/badge/latestdoi/47995577

README.rst

@@ -17,6 +17,8 @@ A discrete event simulation library for queueing networks
 .. image:: https://badges.gitter.im/Join%20Chat.svg
     :target: https://gitter.im/geraintpalmer/Ciw?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge
 
+.. image:: https://zenodo.org/badge/47995577.svg
+	:target: https://zenodo.org/badge/latestdoi/47995577
 
 
 .. figure:: https://github.com/CiwPython/Ciw/blob/master/docs/_static/logo_small.png?raw=true