DOC Updated readme with details of template usage
DOC Updated readme with details of template usage

Updated the documentation in the readme with details of how to use the field in a template.
souldigital/silverstripe-multivaluefield,silverstripe-australia/silverstripe-multivaluefield,designcity/silverstripe-multivaluefield,souldigital/silverstripe-multivaluefield,silverstripe-australia/silverstripe-multivaluefield,designcity/silverstripe-multivaluefield