Create readme.md

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Author: AnandMahajan2799

Server-Side Components/Script Includes/GroupMembershipUtils for client and server/readme.md

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+Utility Script Include for managing user-group relationships in ServiceNow (sys_user_grmember table). 
+
+It provides methods to:
+Retrieve users in a group (getGroupMembers)
+Retrieve groups a user belongs to (getUserGroups)
+Add users to a group (addGroupMembers)
+Remove users from a group (removeGroupMembers)
+
+Supports both client and server-side operations (where applicable), ensures no duplicate group memberships, and simplifies bulk updates.
+
+Ideal for use in server scripts, GlideAjax calls, reference qualifiers, etc to streamline group membership management.