mime-construct: add new recipe

mime-construct constructs and (by default) mails MIME messages.
It is entirely driven from the command line, it is
designed to be used by other programs, or people who act
like programs."

Signed-off-by: Jagadeesh Krishnanjanappa <jkrishnanjanappa@mvista.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>