Add i.MX7D based Meerkat96 board support

The Meerkat96 board, based on the NXP i.MX7D SoC, is a member of
96Boards community and complies with all Consumer Edition board
specifications.

https://www.novtech.com/products/meerkat96.html
https://www.96boards.org/product/imx7-96/

The initial supported/tested devices include:
 - Debug serial
 - SD
 - USB Host (with Ethernet)

With these support, it's good enough for loading Linux Kernel from SD or
Ethernet over USB.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
diff --git a/board/novtech/meerkat96/README b/board/novtech/meerkat96/README
new file mode 100644
index 0000000..bca2fad
--- /dev/null
+++ b/board/novtech/meerkat96/README
@@ -0,0 +1,18 @@
+* Build U-Boot for Meerkat96 board
+
+  $ make mrproper
+  $ make meerkat96_defconfig
+  $ make
+
+  It will generate the U-Boot binary called u-boot-dtb.imx
+
+* Install U-Boot to MicroSD card
+
+  Plug MicroSD card to a Linux machine (with card reader), find the
+  device name and replace sd[x] with the name in the following command.
+
+  $ sudo dd if=u-boot-dtb.imx of=/dev/sd[x] bs=512 seek=2
+
+  It will install U-Boot to MicroSD card at 1KiB offset.  Insert the
+  card to Meerkat96 MicroSD slot, power up the board, and U-Boot should
+  boot from the card.