service/example: add a super simple example. Use in doc.

example/simple/main.go

@@ -0,0 +1,51 @@
+// Copyright 2015 Daniel Theophanes.
+// Use of this source code is governed by a zlib-style
+// license that can be found in the LICENSE file.package service
+
+// simple does nothing except block while running the service.
+package main
+
+import (
+	"log"
+
+	"github.com/kardianos/service"
+)
+
+var logger service.Logger
+
+type program struct{}
+
+func (p *program) Start(s service.Service) error {
+	// Start should not block. Do the actual work async.
+	go p.run()
+	return nil
+}
+func (p *program) run() {
+	// Do work here
+}
+func (p *program) Stop(s service.Service) error {
+	// Stop should not block. Return with a few seconds.
+	return nil
+}
+
+func main() {
+	svcConfig := &service.Config{
+		Name:        "GoServiceTest",
+		DisplayName: "Go Service Test",
+		Description: "This is a test Go service.",
+	}
+
+	prg := &program{}
+	s, err := service.New(prg, svcConfig)
+	if err != nil {
+		log.Fatal(err)
+	}
+	logger, err = s.Logger(nil)
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = s.Run()
+	if err != nil {
+		logger.Error(err)
+	}
+}