Merge pull request #419 from grlee77/badges

add Appveyor, TravisCI, RTD and Zenodo badges to the README

Author: rgommers

README.rst

@@ -1,3 +1,29 @@
++---------------+-----------------+
+| Service       | Master branch   |
++===============+=================+
+| Travis        | |travis_ci|     |
++---------------+-----------------+
+| Appveyor      | |appveyor_ci|   |
++---------------+-----------------+
+| Read the Docs | |read_the_docs| |
++---------------+-----------------+
+
+.. |travis_ci| image:: https://api.travis-ci.org/PyWavelets/pywt.svg?branch=master
+   :align: middle
+   :target: https://travis-ci.org/PyWavelets/pywt
+   :alt: TravisCI Status
+
+.. |appveyor_ci| image:: https://ci.appveyor.com/api/projects/status/github/PyWavelets/pywt
+   :align: middle
+   :target: https://ci.appveyor.com/project/PyWavelets/pywt
+   :alt: Appveyor Status
+
+.. |read_the_docs| image:: https://readthedocs.org/projects/pywavelets/badge/?version=latest
+   :align: middle
+   :target: https://pywavelets.readthedocs.io/en/latest/?badge=latest
+   :alt: Documentation Status
+
+
 PyWavelets
 ==========
 
@@ -94,15 +120,18 @@ interest in PyWavelets are very welcome to join the development team!
 Contact
 -------
 
-Use `GitHub Issues`_ or the `mailing list`_ to post your
-comments or questions.
-
+Use `GitHub Issues`_ or the `mailing list`_ to post your comments or questions.
 
 License
 -------
 
 PyWavelets is a free Open Source software released under the MIT license.
 
+If you wish to cite PyWavelets in a publication, you may use the following DOI.
+
+.. image:: https://zenodo.org/badge/DOI/10.5281/zenodo.1407172.svg
+   :target: https://doi.org/10.5281/zenodo.1407172
+
 .. _built-in wavelet filters: http://wavelets.pybytes.com/
 .. _Cython: http://cython.org/
 .. _demo: https://github.com/PyWavelets/pywt/tree/master/demo