Add a SECURITY.md file with hints for security researchers and other
parties who might report potential security vulnerabilities.
(Bitbake rev: 936fcec41efacc4ce988c81882a9ae6403702bea)
Signed-off-by: Marta Rybczynska <marta.rybczynska@syslinbit.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>