import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

testing/web-platform/tests/CONTRIBUTING.md

@@ -0,0 +1,29 @@
+Grant of License
+----------------
+
+By contributing to this repository, you and the company you represent, if the
+company holds any copyrights in the contribution, grant to the W3C a perpetual,
+non-exclusive, royalty-free, world-wide right and license under all of your
+copyrights in this contribution to copy, publish, use, and modify the
+contribution and to distribute the contribution under a BSD License or one with
+more restrictive terms, as well as a right and license of the same scope to any
+derivative works prepared by the W3C and based on or incorporating all or part
+of the contribution. You further agree that any derivative works of this
+contribution prepared by the W3C shall be solely owned by the W3C.
+
+You state, to the best of your knowledge, that you, or the company you
+represent, have all rights necessary to contribute the materials.
+
+W3C will retain attribution of initial authorship to you. The W3C makes no
+a-priori commitment to support or distribute contributions.
+
+Disclaimer
+----------
+
+All content from this repository is provided as is, and W3C makes no
+representations or warranties, express or implied, including, but not limited
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