Update readme.md, combine both scripts into 1 readme

Author: JohanDC-1999

Server-Side Components/Background Scripts/Duplicate Finder/readme.md

@@ -1,10 +1,11 @@
-## ServiceNow Duplicate Record Finder
-A simple server-side script for ServiceNow that finds and reports on duplicate values for any field on any table. It uses an efficient GlideAggregate query and formats the results into a clean, readable report.
-
+# ServiceNow Duplicate Record Finder
+A simple server-side script for ServiceNow that finds and reports on duplicate values for any field on any table. It uses an efficient `GlideAggregate` query.
+## Find Duplicates by Single Field - `findDuplicatesBySingleField.js`
+This finds duplicates based on a single field which matches
 ### How to Use
 This script is designed to be run in **Scripts - Background** or as a Fix Script.
 1. Navigate: Go to **System Definition > Scripts - Background** (or type sys.scripts.do in the filter navigator).
-2. Copy Script: Copy the entire contents of the script.js file.
+2. Copy Script: Copy the entire contents of the `findDuplicatesBySingleField.js` file.
 3. Paste and Configure: Paste the script into the "Run script" text box. Add the table to search in `tableName` and the field to search for duplicates in `fieldName`
   ```js
   // Update ONLY below values to find duplicates
@@ -22,6 +23,25 @@ This script is designed to be run in **Scripts - Background** or as a Fix Script
   var fieldName = 'short_description';
   ```
 
-
 4. Run Script: Click the "Run script" button. The results will be displayed on the screen below the editor.
 
+## Find Duplicates by Field Combination - `findDuplicatesByCombination.js`
+This is a more powerful script that finds duplicate records based on a unique combination of one or more fields.
+
+### How to use
+This script is also designed to be run in **Scripts - Background**
+1. Navigate: Go to **System Definition > Scripts - Background**
+2. Copy Script: Copy the entire contents of the `findDuplicatesByCombination.js` file.
+3. Paste and Configure: Paste the script into the "Run script" text box. Update the `tableName` field and the `fieldNames` array. The `fieldNames` variable is an array, so even a single field must be enclosed in square brackets `[]`
+
+```js
+// --- UPDATE ONLY THE VALUES BELOW ---
+var tableName = '<table_name>'; // The table you want to check.
+var fieldNames = ['field_1', 'field_2']; // An array of fields for the unique combination.
+```
+
+For example, to find models with the same name, model number and manufacturer
+```js
+var tableName = 'cmdb_model';
+var fieldNames = ['name', 'model_number', 'manufacturer'];
+```