Update README.md

Author: kevinyamauchi

README.md

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 ![SpatialData banner](https://github.com/scverse/spatialdata/blob/main/docs/_static/img/spatialdata_horizontal.png?raw=true)
 
-# an open and universal framework for processing spatial omics data.
+# SpatialData: an open and universal framework for processing spatial omics data.
 
 [![Tests][badge-tests]][link-tests]
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