add motd files

etc/update-motd.d/10-figlet

@@ -0,0 +1,4 @@
+#!/bin/bash
+echo
+figlet -ct -f banner "welcome mr.kan"
+echo

etc/update-motd.d/20-service-status.example

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+echo wg0 status: $(systemctl is-active wg-quick@wg0.service)
+
+if ! systemctl is-active wg-quick@wg0.service &>/dev/null; then
+    echo 'Executing this command may fix wireguard: "sudo apt update && sudo apt install linux-headers-$(uname -r) && sudo reboot"'
+fi
+
+echo