Add a SECURITY.md file with hints for security researchers and other
parties who might report potential security vulnerabilities.
(Bitbake rev: 973aa73b9f1f542f4a636cf8eca733b4df5a778f)
Signed-off-by: Marta Rybczynska <marta.rybczynska@syslinbit.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>