Add motd message with upgrade possibilities

Author: ayufan

package/root/etc/update-motd.d/11-pine-a64-help-text

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+if [ $(id -u) -eq 0 ]; then
+    echo ""
+    echo "Update system with:"
+    echo ""
+    echo " * pine64_update_kernel.sh"
+    echo " * pine64_update_uboot.sh"
+    echo " * pine64_update_package.sh"
+
+    if [ -d /sys/devices/soc.0/1c10000.sdmmc/mmc_host/mmc1 ]; then
+        echo " * pine64_install_to_emmc.sh"
+    fi
+fi