Add code snippet to backup Critical Table Data (#1581)

* Add code snippet to backup Critical Table Data

* update README description

Business Rules/Backup Critical Table Data/README.md

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+# Overview
+This ServiceNow script automates backing up critical record data (such as task or incident records) to an external storage solution. Designed to run as a Business Rule, it helps maintain redundancy for sensitive information by copying specific record details to a backup API whenever a record is created or modified.
+
+# How It Works
+- Data Extraction: Collects key record fields (such as `sys_id`, `number`, `short_description`) from `current`.
+- API Call: Sends a `POST` request with record data to an external backup endpoint.
+- Logging: Outputs API response for monitoring.
+
+# Implementation
+1. Update the `setEndpoint` URL to match your backup API endpoint.
+2. Modify the `recordData` with table data structure as needed.
+3. Ensure the Business Rule is triggered on the appropriate conditions (e.g., on record insert/update) in the target table.

Business Rules/Backup Critical Table Data/backupCriticalTableData.js

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+// Script to back up critical table data to external storage
+(function executeRule(current, previous /*null when async*/) {
+    var recordData = {
+        sys_id: current.sys_id.toString(),
+        number: current.number.toString(),
+        short_description: current.short_description.toString()
+    };
+
+    // Call external API to store data
+    var request = new sn_ws.RESTMessageV2();
+    request.setEndpoint('https://your-backup-api.com/backup');
+    request.setHttpMethod('POST');
+    request.setRequestBody(JSON.stringify(recordData));
+
+    var response = request.execute();
+    gs.info("Backup response: " + response.getBody());
+})(current, previous);
+