lib/cocoa: intro the Hello World example in Cocoa

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>

diff --git a/lib/cocoa/examples/hello_cocoa.nit b/lib/cocoa/examples/hello_cocoa.nit
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+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2014 Alexis Laferrière <alexis.laf@xymus.net>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Hello world using the Cocoa framework
+module hello_cocoa
+
+import cocoa::foundation
+
+in "ObjC" `{
+       #import <Foundation/Foundation.h>
+`}
+
+# Print `"Hello world!"` to the log
+fun hello_world in "ObjC" `{
+       @autoreleasepool {
+               NSLog(@"Hello World!");
+       }
+`}
+
+hello_world

diff --git a/tests/sav/hello_cocoa.res b/tests/sav/hello_cocoa.res
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+UNDEFINED