memtest86+: Add license file

Memtest86+ is licensed under GPL v2, as is stated in the header
of many, but not all of the files.

We are adding a coverity scan of the source code, and they
requested that we add a license file to the root of the project.

Change-Id: I24d4ef7fab458d6efee4af5e63419d1e39c0c6c0
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/14101
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed