Update README.md

Author: pgleeson

README.md

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 ## Top-down laminar organization of the excitatory network in motor cortex
 
+[![Continuous build using OMV](https://github.com/OpenSourceBrain/WeilerEtAl08-LaminarCortex/actions/workflows/omv-ci.yml/badge.svg)](https://github.com/OpenSourceBrain/WeilerEtAl08-LaminarCortex/actions/workflows/omv-ci.yml)
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 Models based on data in:  Weiler N, Wood L, Yu J, Solla SA, Shepherd GM (2008) [Top-down laminar organization of the 
 excitatory network in motor cortex](http://www.nature.com/neuro/journal/v11/n3/full/nn2049.html). Nat Neurosci 11:360-6