Added instructions for developing on Magento core

README.md

@@ -172,6 +172,12 @@ curl -s https://raw.githubusercontent.com/markshust/docker-magento/master/lib/te
 # Download the version of Magento you want to use with:
 bin/download 2.4.2
 
+# or for Magento core development:
+# docker-compose -f docker-compose.yml up -d
+# bin/setup-composer-auth
+# bin/cli git clone git@github.com:magento/magento2.git .
+# git checkout 2.4-develop
+
 # Create a DNS host entry for the site:
 echo "127.0.0.1 ::1 magento.test" | sudo tee -a /etc/hosts