EDK II Packages: Added License.txt files

License.txt is a per-project document showing the license terms
used by that project.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.martin@arm.com>




git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13194 6f19259b-4bc3-4df7-8a09-765794883524