Add NumFocus logo and text (#330)

README.md

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+[![Powered by NumFOCUS][badge-numfocus]][link-numfocus]
 
 SpatialData is a data framework that comprises a FAIR storage format and a collection of python libraries for performant access, alignment, and processing of uni- and multi-modal spatial omics datasets. This repository contains the core spatialdata library. See the links below to learn more about other packages in the SpatialData ecosystem.
 
+[//]: # "numfocus-fiscal-sponsor-attribution"
+
+SpatialData is part of the scverse project ([website](https://scverse.org), [governance](https://scverse.org/about/roles)) and is fiscally sponsored by [NumFOCUS](https://numfocus.org/).
+Please consider making a tax-deductible [donation](https://numfocus.org/donate-to-scverse) to help the project pay for developer time, professional services, travel, workshops, and a variety of other needs.
+
+<a href="https://numfocus.org/project/scverse">
+  <img
+    src="https://raw.githubusercontent.com/numfocus/templates/master/images/numfocus-logo.png"
+    width="200"
+  >
+</a>
+
+[badge-numfocus]: https://img.shields.io/badge/powered%20by-NumFOCUS-orange.svg?style=flat&colorA=E1523D&colorB=007D8A
+[link-numfocus]: http://numfocus.org
+
 -   [spatialdata-io](https://github.com/scverse/spatialdata-io): load data from common spatial omics technologies into spatialdata.
 -   [spatialdata-plot](https://github.com/scverse/spatialdata-plot): Static plotting library for spatialdata.
 -   [napari-spatialdata](https://github.com/scverse/napari-spatialdata): napari plugin for interactive exploration and annotation of spatialdata.