Added README.

README.txt

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+JEP 25 Reference Implementation README
+======================================
+
+This a work-in-progress reference implementation of JEP-25, aka Chrome
+Boosters:
+
+  https://wiki.mozilla.org/Labs/Jetpack/JEP/25
+
+This is a lightweight XULRunner application, so as to make the
+implementation application-agnostic and not inadvertently cause us to
+use technologies particular to Firefox, Thunderbird, or any other
+XULRunner application. A side benefit is that the test suite is
+able to load and run fairly quickly, since no temporary profile
+needs to be created or loaded, etc.
+
+Running The Test Suite
+----------------------
+
+The test suite can automatically be run by executing the following
+command from the root directory of the repository:
+
+  python run_tests.py
+
+The runner will automatically attempt to download necessary CommonJS
+compliance tests if they're not already available.  It will also
+automatically find a Firefox installation to use as the XULRunner
+host, though you can also specify a different binary through the
+command-line.  Run 'python run_tests.py --help' for more information
+on this.
+
+Examining The Code
+------------------
+
+The primary script that implements JEP 25 is located at:
+
+  chrome/modules/booster.js
+
+This script is all that's needed to take advantage of JEP 25's
+features in any XULRunner extension. The code which uses this
+implementation in the test runner is located here:
+
+  chrome/content/main.xul
+  chrome/content/main.js
+
+If you have any other questions, feel free to send them to the
+Jetpack mailing list:
+
+  http://groups.google.com/group/mozilla-labs-jetpack/