Add a README file to help users getting started with the board. Signed-off-by: Diego Dorta <diego.dorta@nxp.com> Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com> Reviewed-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Jagan Teki <jagan@openedev.com>
