Updated README adding composer install to existing projects

README.md

@@ -197,6 +197,9 @@ curl -s https://raw.githubusercontent.com/markshust/docker-magento/master/lib/te
 cp -R ~/Sites/existing src
 # or: git clone git@github.com:myrepo.git src
 
+# If your vendor directory was empty, populate it with:
+bin/composer install
+
 # Start some containers, copy files to them and then restart the containers:
 bin/start --no-dev
 bin/copytocontainer --all ## Initial copy will take a few minutes...