Work with Liquid template language in Power Apps portals

Liquid is an [open-source template language](http://dotliquidmarkup.org/?azure-portal=true) that is integrated natively into Microsoft Power Apps portals. It acts as a bridge between Microsoft Dataverse and the HTML or text output that is sent to the browser. Liquid can be used to add dynamic content to pages and to create a variety of custom templates. Additionally Liquid provides access only to the data and operations that are explicitly allowed by the portals.