imx8mn: evk: add README

Add a README for users to build a workable image.

Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

diff --git a/board/freescale/imx8mn_evk/README b/board/freescale/imx8mn_evk/README
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+U-Boot for the NXP i.MX8MN EVK board
+
+Quick Start
+===========
+- Build the ARM Trusted firmware binary
+- Get firmware-imx package
+- Build U-Boot
+- Boot
+
+Get and Build the ARM Trusted firmware
+======================================
+Note: srctree is U-Boot source directory
+Get ATF from: https://source.codeaurora.org/external/imx/imx-atf
+branch: imx_4.19.35_1.1.0
+$ make PLAT=imx8mn bl31
+$ cp build/imx8mn/release/bl31.bin $(srctree)
+
+Get the ddr firmware
+=============================
+$ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.5.bin
+$ chmod +x firmware-imx-8.5.bin
+$ ./firmware-imx-8.5
+$ cp firmware-imx-8.5/firmware/ddr/synopsys/ddr4*.bin $(srctree)
+
+Build U-Boot
+============
+$ export CROSS_COMPILE=aarch64-poky-linux-
+$ make imx8mn_ddr4_evk_defconfig
+$ export ATF_LOAD_ADDR=0x960000
+$ make flash.bin
+
+Burn the flash.bin to MicroSD card offset 32KB
+$sudo dd if=flash.bin of=/dev/sd[x] bs=1024 seek=32
+
+Boot
+====
+Set Boot switch to SD boot