Work on CITATION.rst

Author: drvinceknight

CITATION.rst

@@ -0,0 +1,15 @@
+Please use the following to cite the latest version of the Ciw library::
+
+    @misc{ciwpython,
+      author       = {{ {The Ciw library developers} }}
+      title        = {Ciw: <RELEASE TITLE>},
+      year         = <YEAR>,
+      doi          = {<DOI INFORMATION>},
+      url          = {http://dx.doi.org/10.5281/zenodo.<DOI NUMBER>}
+    }
+
+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