Add example for idle

examples/idle_server_shutdown/main.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"go.balki.me/anyhttp/idle"
+)
+
+func main() {
+	idler := idle.CreateIdler(10 * time.Second)
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		idler.Tick()
+		w.Write([]byte("Hey there!\n"))
+	})
+
+	http.HandleFunc("/job", func(w http.ResponseWriter, r *http.Request) {
+		go func() {
+			idler.Enter()
+			defer idler.Exit()
+
+			time.Sleep(15 * time.Second)
+		}()
+		w.Write([]byte("Job scheduled\n"))
+	})
+
+	server := http.Server{
+		Addr: ":8888",
+	}
+	go server.ListenAndServe()
+	idler.Wait()
+	server.Shutdown(context.TODO())
+}