Smart Assign task to available member (#2190)

* Create README.md

* Create implement smart assignment to available group members

Author: Soumyadeep10

Client-Side Components/UI Actions/Smart Assign to available member/README.md

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+**Use-case:**
+The primary goal of this UI Action is load-balancing.
+It assigns tasks based on the fewest currently Active tasks assigned to a member in a group.
+
+**Example Scenario**:
+An assignment group has 10 members. Instead of assigning a new task to the whole group or any random member, the user/agent clicks on
+"Smart Assign" to find the member with the fewest currently Active tasks in the same group and assign the task to them.
+
+**UI Action Name:**
+Smart Assign
+
+**Condition**: !current.assignment_group.nil() && current.assigned_to.nil()
+
+**How it works:**
+1. The code queries the Group members table to find every single user associated with the currently selected assignment group.
+   If someone removes a previous assignement group and then clicks on Smart Assign button, they are shown an error message to choose an Assignment group.
+2. There is a loop on the task table. This loop uses GlideAggregate to count how many active records are assigned to a specific user.
+3. It tracks the user that has the lowest count of tasks assigned to them and assigns the current task to them.

Client-Side Components/UI Actions/Smart Assign to available member/smartAssigntoAvailablemember.js

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+var assignedToId = '';
+var minOpenTasks = 77777;
+var targetGroup = current.assignment_group;
+
+if (!targetGroup) {
+    gs.addErrorMessage('Please select an Assignment Group first.');
+    action.setRedirectURL(current);
+}
+
+//Finding all active members in the target group
+var member = new GlideRecord('sys_user_grmember');
+member.addQuery('group', targetGroup);
+member.query();
+
+while (member.next()) {
+    var userId = member.user.toString();
+
+    //CountIng the number of active tasks currently assigned to the member
+    var taskCountGR = new GlideAggregate('task');
+    taskCountGR.addQuery('assigned_to', userId);
+    taskCountGR.addQuery('active', true);
+    taskCountGR.addAggregate('COUNT');
+    taskCountGR.query();
+
+    var openTasks = 0;
+    if (taskCountGR.next()) {
+        openTasks = taskCountGR.getAggregate('COUNT');
+    }
+
+    //Checking if this member has fewer tasks than the current minimum
+    if (openTasks < minOpenTasks) {
+        minOpenTasks = openTasks;
+        assignedToId = userId;
+    }
+}
+
+//Assigning the current record to the chosen user
+if (assignedToId) {
+    current.assigned_to = assignedToId;
+    current.work_notes = 'Assigned via Smart Assign to the user with the fewest active tasks (' + minOpenTasks + ' open tasks).';
+    current.update();
+    gs.addInfoMessage('Incident assigned to ' + current.assigned_to.getDisplayValue() + '.');
+} else {
+    gs.addErrorMessage('Could not find an active member in the group to assign the task.');
+}
+
+action.setRedirectURL(current);