improved read me to activeGroupsWithoutMembers

Server-Side Components/Background Scripts/Fetch Active Groups list without members/README.md

@@ -1,2 +1,16 @@
-Sample code to clean up the Groups with no members.
-This code help to get the Active groups list  with no members
+A background script that identifies and returns all active groups in ServiceNow that have no members assigned to them.
+
+## What It Does
+
+The script:
+1. Queries all active groups in the `sys_user_group` table
+2. For each group, checks the `sys_user_grmember` table for member count
+3. Uses GlideAggregate to efficiently count members per group
+4. Collects group names (or sys_ids) that have zero members
+5. Outputs the complete list of empty groups to the system log
+
+## Configuration Options
+
+- **Group names vs IDs**: Uncomment line 21 to collect group sys_ids instead of names
+- **Limit results**: Uncomment line 6 to limit the query to 1500 groups for large instances
+- **Additional filtering**: Modify the encoded query on line 3 to add specific group criteria