Update README.md

Author: pgleeson

README.md

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 [![Continuous build using OMV](https://github.com/OpenSourceBrain/MOOSEShowcase/actions/workflows/omv-ci.yml/badge.svg)](https://github.com/OpenSourceBrain/MOOSEShowcase/actions/workflows/omv-ci.yml)
 
 OSB Showcase project illustrating interactions between the [MOOSE simulator](https://moose.ncbs.res.in) & NeuroML. See also [here](https://docs.neuroml.org/Userdocs/Software/SupportingTools.html#moose). 
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