完善所以c#相关的文档和代码

codes/csharp/chapter_stack_and_queue/queue.cs

@@ -0,0 +1,41 @@
+using System;
+using hello_algo.include;
+using NUnit.Framework;
+
+namespace hello_algo.chapter_stack_and_queue
+{
+    public class queue
+    {
+        [Test]
+        public void Test()
+        {
+            /* 初始化队列 */
+            Queue<int> queue = new();
+
+            /* 元素入队 */
+            queue.Enqueue(1);
+            queue.Enqueue(3);
+            queue.Enqueue(2);
+            queue.Enqueue(5);
+            queue.Enqueue(4);
+            Console.WriteLine("队列 queue = " + String.Join(",", queue.ToArray()));
+
+            /* 访问队首元素 */
+            int peek = queue.Peek();
+            Console.WriteLine("队首元素 peek = " + peek);
+
+            /* 元素出队 */
+            int poll = queue.Dequeue();
+            Console.WriteLine("出队元素 poll = " + poll + "，出队后 queue = " + String.Join(",", queue.ToArray()));
+
+            /* 获取队列的长度 */
+            int size = queue.Count();
+            Console.WriteLine("队列长度 size = " + size);
+
+            /* 判断队列是否为空 */
+            bool isEmpty = queue.Count() == 0;
+            Console.WriteLine("队列是否为空 = " + isEmpty);
+        }
+    }
+
+}