Change 290953 had a related patch set uploaded (by Jdrewniak):
T135902 readme, license and contribution files - README file - CONTRIBUTING file - LICENSE file - CC license on wikipedia.org

https://gerrit.wikimedia.org/r/290953

Adding new information from Legal to create a new license file:

Add the license by adding the following text to a file called LICENSE in the root director of the repo:

Copyright (c) 2016 [Either: Wikimedia Foundation, or a list of individual engineers who contributed to it]

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.

Change 290953 merged by jenkins-bot:
T135902 readme, license and contribution files - README file - CONTRIBUTING file - LICENSE file - CC license on wikipedia.org

https://gerrit.wikimedia.org/r/290953

This was pushed to production on June 7, 2016

The wikipedia.org page code license file is here
https://github.com/wikimedia/portals/blob/master/LICENSE