Update README.md

Author: JoshuaHarris391

README.md

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 This repository aims to provide the documentation, learning materials, and software tools to facilitate the creation of a data model in Gen3.
 
-[Github Repo](https://github.com/AustralianBioCommons/gen3schemadev)
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 ***Pre-Reading**: Please become familiar with some [core data modelling concepts](docs/core_concepts/pre_reading.md) before starting.*