[honu] add macro user api

collects/honu/core/api.rkt

@@ -0,0 +1,13 @@
+#lang racket/base
+
+;; Public API for interfacing with the honu macro system
+
+(require "private/syntax.rkt"
+         "private/literals.rkt"
+         (for-syntax "private/compile.rkt"
+                     "private/parse2.rkt"))
+(provide define-honu-syntax
+         define-literal
+         (for-syntax racket-syntax
+                     honu-expression
+                     parse-all))