Add QUnit to the third party directory

third_party/qunit/README.chromium

+Name: QUnit
+Short Name: QUnit
+URL: https://github.com/jquery/qunit
+Version: 1.14.0
+License: MIT
+Security Critical: no
+
+Description:
+QUnit is a powerful, easy-to-use, JavaScript unit testing framework. It's used
+by the jQuery project to test its code and plugins but is capable of testing any
+generic JavaScript code (and even capable of testing JavaScript code on the
+server-side).
+
+QUnit is especially useful for regression testing: Whenever a bug is reported,
+write a test that asserts the existence of that particular bug. Then fix it and
+commit both. Every time you work on the code again, run the tests. If the bug
+comes up again - a regression - you'll spot it immediately and know how to fix
+it, because you know what code you just changed.
+
+Having good unit test coverage makes safe refactoring easy and cheap. You can
+run the tests after each small refactoring step and always know what change
+broke something.
+
+QUnit is similar to other unit testing frameworks like JUnit, but makes use of
+the features JavaScript provides and helps with testing code in the browser,
+e.g. with its stop/start facilities for testing asynchronous code.
+
+It is currently used by the chrome remote desktop team for JavaScript unit
+testing.
+
+Local Modifications:
+None