Update README.md

README.md

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 - helper scripts used in the IMCF workflow to register and analyse 3D volumes of mouse brain.
 - the workflow is documented on the Biozentrums internal wiki space: https://wiki.biozentrum.unibas.ch/x/xEBwEw
 
+## median.ijm
+- IJ-macro. Applies a 15px median filter to an image and saves the resulting image
+
 ## remap_labelimage.py
 - Fiji macro to workaround a bug in Imaris measurement
 - re-maps the reference atlas label image