Add remove group member (#885)

* Created a script include to add and remove group member.

* Description for "Add and Remove Group Member" script include.

* Update readme.md

Author: shivamTodwal

Script Includes/Add and Remove Group Member/groupMember.js

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+//A script include to add and remove member from a group. We need to pass the sys_id of the group and user to both addMember and removeMember function.
+var GroupMember = Class.create();
+GroupMember.prototype = {
+    initialize: function() {},
+
+    addMember: function(groupSysId, userSysId) {
+        var groupMemberGR = new GlideRecord('sys_user_grmember');
+        groupMemberGR.initialize();
+        groupMemberGR.setValue('group', groupSysId);
+        groupMemberGR.setValue('user', userSysId);
+        groupMemberGR.insert();
+    },
+
+    removeMember: function(groupSysId, userSysId) {
+        var groupMemberGR = new GlideRecord('sys_user_grmember');
+        groupMemberGR.addQuery('group', groupSysId);
+        groupMemberGR.addQuery('user', userSysId);
+        groupMemberGR.query();
+        if (groupMemberGR.next()) {
+            groupMemberGR.deleteRecord();
+        }
+    },
+
+    type: 'GroupMember'
+};

Script Includes/Add and Remove Group Member/readme.md

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+# Add and Remove Group Member
+I've developed a script include that facilitates the addition and removal of members from a group.
+Both the "addMember" and "removeMember" functions in this script include require the sys_id of the group and the user as input parameters.