services: Add example service to base new services off of

services/sv/_example/log/run

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+exec svlogd -ttt /home/marty/myservice/logs

services/sv/_example/run

@@ -0,0 +1,4 @@
+#!/bin/sh -e
+
+exec 2>&1
+exec /home/marty/myservice/example-service.sh