add copyright header

Author: puredanger

src/main/clojure/clojure/tools/cli.cljc

@@ -1,3 +1,11 @@
+;   Copyright (c) Rich Hickey. All rights reserved.
+;   The use and distribution terms for this software are covered by the
+;   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
+;   which can be found in the file epl-v10.html at the root of this distribution.
+;   By using this software in any fashion, you are agreeing to be bound by
+;   the terms of this license.
+;   You must not remove this notice, or any other, from this software.
+
 (ns ^{:author "Gareth Jones, Sung Pae, Sean Corfield"
       :doc "Tools for working with command line arguments."}
   clojure.tools.cli