fix name policy

Exceptions/YYApiException.cs

@@ -0,0 +1,16 @@
+using System;
+namespace YYApi.Exceptions
+{
+    /// <summary>
+    /// Api错误捕获异常
+    /// </summary>
+    public class YYApiException : Exception
+    {
+        public int Code { get; }
+
+        public YYApiException(int code, string message = "") : base(message)
+        {
+            Code = code;
+        }
+    }
+}