Feature/excel to mrvs populate (#2211)

* Create README.md

Updating readme file with script functionality.

* Create ParsingScript.js

script to be used in script include

* Update README.md

Script working details

Author: chaitanyalal18

Server-Side Components/Script Includes/Populate MRVS from Excel/ParsingScript.js

@@ -0,0 +1,20 @@
+parseExcel: function() {
+    var attachSysId = this.getParameter('sysparm_id');
+    var attachment = new GlideSysAttachment();
+    var parser = new sn_impex.GlideExcelParser();
+    var mrvsArray = [];
+    // get content of the attachment
+    var content = attachment.getContentStream(attachSysId);
+    parser.parse(content);
+    // Iterate through each row after header. Return false if row doesn't exist
+    while (parser.next()) {
+        // get content of the row
+        var row = parser.getRow();
+        //push the object with key same as variable name in the MRVS.
+        var obj = {};
+        obj.employee_id = row['Id'];
+        obj.employee_name = row['Name'];
+        mrvsArray.push(obj);
+    }
+    return JSON.stringify(mrvsArray);
+},

Server-Side Components/Script Includes/Populate MRVS from Excel/README.md

@@ -0,0 +1,16 @@
+This script allows to parse the excel file attached to the attachment variable and populate the MRVS present in the
+catalog item / record producer.
+Use this script in a client-callable script include along with an onChange client script on the attachment variable.
+
+When a file is uploaded as an attachment, it's metdata is stored in the sys_attachment table and sys_attachment_doc contains
+the actual binary content.
+
+**getContentStream()** converts the binary content in a way so that it can be parsed by GlideExcelParser API.
+
+**Example used-**
+
+The excel has two columns "Id" and "Name" to store employee details. MRVS also has the variable name as "employee_id" and "employee_name".
+
+
+
+