Create README.md

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.