Add LICENSE
Add LICENSE

This is the standard MIT license that we use in most of our open source
projects.

Change-Id: Id82755079bace6f3752fbda32def83f7e5fcc8d9
Reviewed-on: https://gerrit.causes.com/24872
Reviewed-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>
Tested-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>

causes/twigg,causes/twigg