Add RequireNonNull

http://www.yinwang.org/blog-cn/2015/11/21/programming-philosophy

Wox.Infrastructure/SyntaxSuger.cs

@@ -0,0 +1,19 @@
+using System;
+
+namespace Wox.Infrastructure
+{
+    static class SyntaxSuger<T>
+    {
+        public static T RequireNonNull(T obj)
+        {
+            if (obj == null)
+            {
+                throw new NullReferenceException();
+            }
+            else
+            {
+                return obj;
+            }
+        }
+    }
+}