Add README.md for Queue (#2483)

DataStructures/Queues/README.md

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+# Queue
+- The Queue interface is present in the `java.util` package.
+- It is an ordered list of objects that follows the **FIFO** (First-In-First-Out) principle.
+
+## Characteristics of a Queue
+- The Queue is used to insert elements at the end of the queue and removes elements from the beginning of the queue.
+- It supports all methods of Collection interface including insertion, deletion etc.
+- LinkedList, ArrayBlockingQueue and PriorityQueue are the most commonly used implementations.
+
+## Declaration
+
+`Queue<Obj> queue = new PriorityQueue<Obj> ();` 
+
+## Important operations
+
+| Operations | Description |
+| ----------- | ----------- |
+|Enqueue|Adds an item to the queue|
+|Dequeue|Removes an item from the queue|
+|Front|Gets the front item from the queue|
+|Rear|Gets the last item from the queue|
+
+