Added howto to reference.
Added howto to reference.



Former-commit-id: 79af1c56a31f835cae8399c979cb70d5b5bbbf32
ricklon/chipKIT32-MAX,tintin304/chipKIT32-MAX,majenkotech/chipKIT32-MAX,adamwolf/chipKIT32-MAX,adamwolf/chipKIT32-MAX,adamwolf/chipKIT32-MAX,ricklon/chipKIT32-MAX,chipKIT32/chipKIT32-MAX,chipKIT32/chipKIT32-MAX,EmbeddedMan/chipKIT32-MAX,tintin304/chipKIT32-MAX,tintin304/chipKIT32-MAX,EmbeddedMan/chipKIT32-MAX,EmbeddedMan/chipKIT32-MAX,tintin304/chipKIT32-MAX,EmbeddedMan/chipKIT32-MAX,majenkotech/chipKIT32-MAX,tintin304/chipKIT32-MAX,ricklon/chipKIT32-MAX,ricklon/chipKIT32-MAX,EmbeddedMan/chipKIT32-MAX,majenkotech/chipKIT32-MAX,majenkotech/chipKIT32-MAX,majenkotech/chipKIT32-MAX,tintin304/chipKIT32-MAX,adamwolf/chipKIT32-MAX,adamwolf/chipKIT32-MAX,chipKIT32/chipKIT32-MAX,ricklon/chipKIT32-MAX,chipKIT32/chipKIT32-MAX,ricklon/chipKIT32-MAX,EmbeddedMan/chipKIT32-MAX,chipKIT32/chipKIT32-MAX,majenkotech/chipKIT32-MAX,chipKIT32/chipKIT32-MAX,chipKIT32/chipKIT32-MAX,tintin304/chipKIT32-MAX,EmbeddedMan/chipKIT32-MAX,ricklon/chipKIT32-MAX,majenkotech/chipKIT32-MAX,adamwolf/chipKIT32-MAX,adamwolf/chipKIT32-MAX