Each repository should include a licence file
This should be called
LICENCE.md. “License” is the U.S. English spelling.
GitHub.com will still show licence details for the British English spelling.
At GDS we use the MIT License.
Make sure the licence content is included in full, including the title “The MIT License”, so that readers are quickly able to see what licence is being used.
The Copyright is Crown Copyright; you can put “Government Digital Service” in brackets.
Copyright (c) 2017 Crown Copyright (Government Digital Service).
The year should be the year the code was first published. Where the code is continually updated with significant changes, the year can be shown as a period from first to most recent update (e.g. 2015-2017).
For more information on copyright notices, see the UK Copyright Service fact sheet.
There is a good example of a licence in the pay-adminusers repo.