licensing: added COPYRIGHT required by MIT license.

Pulled from
http://git.musl-libc.org/cgit/libc-bench/plain/COPYRIGHT?id=b6b2ce5f9f87a09b14499cb00c600c601f022634

BUG=chromium:323243
TEST=N/A

Change-Id: If2da5036bc769e898490f014cb891e3b23530b0b
Reviewed-on: https://chromium-review.googlesource.com/193140
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Marc MERLIN <merlin@chromium.org>
Tested-by: Marc MERLIN <merlin@chromium.org>
diff --git a/COPYRIGHT b/COPYRIGHT
new file mode 100644
index 0000000..7c55894
--- /dev/null
+++ b/COPYRIGHT
@@ -0,0 +1,23 @@
+libc-bench, a performance and memory usage benchmark for comparing
+libc implementations
+
+Copyright © 2011 Rich Felker
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.