Updated documentation

Author: bryanjos

README.md

@@ -1,6 +1,21 @@
 Elixir-ESTree
 ============
 
-Defines structs that represent the ESTree AST definitions. Also includes a JavaScript AST to JavaScript code generator.
+Defines structs that represent the JavaScript AST nodes from the ESTree spec. 
 
 [ESTree Spec](https://github.com/estree/estree)
+
+Also includes a JavaScript AST to JavaScript code generator.
+
+```elixir
+alias ESTree.Tools.Builder
+alias ESTree.Tools.Generator
+
+ast = Builder.array_expression([
+  Builder.literal(1),
+  Builder.identifier(:a)
+])
+
+Generator.generate(ast)
+#"[1, a]"
+```

lib/es_tree.ex

@@ -1,8 +1,21 @@
 defmodule ESTree do
   @moduledoc """
-  Defines structs that represent the ESTree AST definitions. Also includes a JavaScript AST to JavaScript code generator.
+  Defines structs that represent the JavaScript AST nodes from the ESTree spec. 
 
   [ESTree Spec](https://github.com/estree/estree)
+
+  Also includes a JavaScript AST to JavaScript code generator.
+
+      alias ESTree.Tools.Builder
+      alias ESTree.Tools.Generator
+
+      ast = Builder.array_expression([
+        Builder.literal(1),
+        Builder.identifier(:a)
+      ])
+
+      Generator.generate(ast)
+      #"[1, a]"
   """
 
   @type unary_operator  ::  :- | :+ | :! | :"~" | :typeof | :void | :delete