Added missing header comment

src/posix/cocoa/i_timer.cpp

@@ -1,3 +1,35 @@
+/*
+ ** i_timer.cpp
+ **
+ **---------------------------------------------------------------------------
+ ** Copyright 2012-2015 Alexey Lysiuk
+ ** All rights reserved.
+ **
+ ** Redistribution and use in source and binary forms, with or without
+ ** modification, are permitted provided that the following conditions
+ ** are met:
+ **
+ ** 1. Redistributions of source code must retain the above copyright
+ **    notice, this list of conditions and the following disclaimer.
+ ** 2. Redistributions in binary form must reproduce the above copyright
+ **    notice, this list of conditions and the following disclaimer in the
+ **    documentation and/or other materials provided with the distribution.
+ ** 3. The name of the author may not be used to endorse or promote products
+ **    derived from this software without specific prior written permission.
+ **
+ ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ ** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ ** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ ** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ ** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ ** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ ** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ **---------------------------------------------------------------------------
+ **
+ */
 
 #include <assert.h>
 #include <sys/time.h>