Print friendly UI action (#2638)

* Create printer_friendly_verison.js

* Create README.md

Author: DavidMarcial

Client-Side Components/UI Actions/Printer Friendly Version/README.md

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+## Overview
+
+
+This code snippet UI Action will allow you to have a printer friendly version of whatever record you might are trying to print. 
+This UI action uses the GlideNavigation API which you can find here [GlideNavigation API](https://developer.servicenow.com/dev.do#!/reference/api/zurich/client/c_GlideNavigationV3API#r_GNV3-openPopup_S_S_S_B)

Client-Side Components/UI Actions/Printer Friendly Version/printer_friendly_verison.js

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+printView()
+
+function printView() {
+
+  var table = g_form.getTableName();
+  var recordID = g_form.getUniqueValue();
+  var view = {{Insert the view you want to print here}}; //You can pass in an empty string and it will still work
+  var windowName = {{Insert the name you want your window to display}}; //You can pass in an empty string and it will still work
+  var features = 'resizeable,scrollbar'; //You can pass in an empty string and it will still work
+  var urlString = '/' + table + ".do?sys_id=" + recordID + "&sysparm_view=" + view + "&sysparm_media=print";
+  var noStack = true; //Flag that indicates whether to append sysparm_stack=no to the URL
+
+  g_navigation.openPopup(urlString, windowName, features, noStack);
+
+}