Test for resolving static members of java enum

Add clarifying note

compiler/testData/javaDescriptorResolver/staticMembers/Enum.java

@@ -0,0 +1,15 @@
+package test;
+
+public enum Enum {
+    A,
+    B,
+    C;
+
+    public static class Nested {
+        void foo() {}
+    }
+
+    public class Inner {
+        void bar() {}
+    }
+}