stub documentation for Macro

Author: moritz

lib/Macro.pod

@@ -0,0 +1,11 @@
+=begin pod
+
+=TITLE class Macro
+
+    class Macro is Routine { }
+
+A macro is a Routine whose invocation typically happens during
+parsing. By returning an L<AST>, a macro can inject code into
+the calling location.
+
+=end pod