Add SerdeAnnotated

Author: 9il

source/mir/serde.d

@@ -65,6 +65,23 @@ version (D_Exceptions)
     }
 }
 
+/++
+Constructs annotated type.
++/
+template SerdeAnnotated(T, string annotation)
+{
+    ///
+    @serdeAlgebraicAnnotation(annotation)
+    @serdeProxy!T
+    struct SerdeAnnotated
+    {
+        ///
+        T value;
+        ///
+        alias value this;
+    }
+}
+
 /++
 Helper enumeration for for serializer .
 Use negative `int` values for user defined targets.