Add JOSS DOI to README and docs.

README.rst

@@ -19,12 +19,22 @@ ndcube
 .. |Powered by SunPy| image:: http://img.shields.io/badge/powered%20by-SunPy-orange.svg?style=flat
    :target: http://www.sunpy.org
    :alt: SunPy
+.. image:: https://joss.theoj.org/papers/10.21105/joss.05296/status.svg
+   :target: https://doi.org/10.21105/joss.05296
+   :alt: JOSS
 
-ndcube is an open-source SunPy affiliated package for manipulating, inspecting and visualizing multi-dimensional contiguous and non-contiguous coordinate-aware data arrays.
+``ndcube`` is an open-source SunPy affiliated package for manipulating, inspecting and visualizing multi-dimensional contiguous and non-contiguous coordinate-aware data arrays.
 
 It combines data, uncertainties, units, metadata, masking, and coordinate transformations into classes with unified slicing and generic coordinate transformations and plotting/animation capabilities.
 It is designed to handle data of any number of dimensions and axis types (e.g. spatial, temporal, spectral, etc.) whose relationship between the array elements and the real world can be described by World Coordinate System (WCS) translations.
 
+Acknowledging ndcube
+====================
+If you use ``ndcube`` is your work, we kindly ask you to `acknowledge ndcube`_ in your
+publications and presentations.
+
+.. _acknowledge ndcube: https://docs.sunpy.org/projects/ndcube/en/stable/acknowledging.html
+
 Installation
 ============
 

docs/acknowledging.rst

@@ -0,0 +1,18 @@
+.. _acknowledging:
+
+************************
+Acknowledging ``ndcube``
+************************
+
+If you use ``ndcube``, we kindly ask you to cite the following references in you publications:
+
+* Ryan, Mumford et al., ndcube: Manipulating N-dimensional Astronomical Data in Python, Journal of Open Source Software, 2023a, DOI: https://doi.org/10.21105/joss.05296
+
+Citing these references helps to spread awareness of ``ndcube``'s capabilities and philosophy and
+gives some credit to those who have volunteered their time in making ``ndcube`` possible.
+To learn how to become part of the ``ndcube`` project, see :ref:`contributing`.
+
+You may also like to include the `ndcube logo`_ in your presentations. This helps to publicise
+``ndcube`` to others who might find it helpful in their work.
+
+.. _ndcube logo: https://github.com/sunpy/ndcube/tree/ee94395cda5c8348a33bd1f9ff75fab976bdc66f/docs/logo

docs/index.rst

@@ -78,6 +78,7 @@ where appropriate.
 
    introduction
    installation
+   acknowledging
    explaining_ndcube/index
    reference/index
    generated/gallery/index