improved read me (#2318)

Author: ChaseMillers

Server-Side Components/Background Scripts/GetRecordsFromMultipleTables/README.md

@@ -1 +1,29 @@
-Creating a background script to print the total count of all tables with a specific filter condition
+A background script that retrieves record counts from multiple ServiceNow tables with date filtering, providing a comprehensive data audit report.
+
+## What It Does
+
+The script:
+1. Defines an array of table names to query (60+ tables by default)
+2. Iterates through each table using `forEach()` to process them systematically
+3. Uses `GlideAggregate` with COUNT aggregate for efficient record counting
+4. Applies a date filter to count records updated before a specific date
+5. Handles errors gracefully with try-catch blocks for invalid table names
+6. Outputs results in a formatted table structure with pipe separators
+
+
+## Sample Output
+
+```
+| Table |    Records 
+| customer_account |    1,245 records
+| cmn_location |    87 records
+| customer_contact |    3,456 records
+| cmdb_ci |    12,789 records
+We've got an error for table: invalid_table_name
+```
+
+## Configuration Options
+
+- **Date filtering**: Modify `sys_updated_on<=javascript:gs.dateGenerate('YYYY-MM-DD','HH:mm:ss')` to change the cutoff date
+- **Custom table list**: Replace the `tablesList` array with your specific tables of interest
+- **Additional filters**: Add more encoded query conditions like `active=true` or specific field criteria