add accesslog slack example to the examples folder

_examples/logging/request-logger/accesslog-slack/main.go

@@ -1,5 +1,44 @@
 package main
 
+import (
+	"os"
+	"time"
+
+	"github.com/kataras/iris/v12"
+	"github.com/kataras/iris/v12/middleware/accesslog"
+)
+
+var (
+	// https://api.slack.com/apps/your_app_id/oauth
+	token = os.Getenv("SLACK_BOT_TOKEN")
+	// on slack app: right click on the channel -> view channel details -> on bottom, copy the channel id.
+	channelID = os.Getenv("SLACK_CHANNEL_ID")
+)
+
+// $ go run .
 func main() {
-	println("Navigate to: https://github.com/kataras/iris/issues/1808#issuecomment-1013757925")
+	app := iris.New()
+
+	ac := accesslog.New(os.Stdout) // or app.Logger().Printer
+	ac.LatencyRound = time.Second
+	ac.SetFormatter(&Slack{
+		Token:         token,
+		ChannelIDs:    []string{channelID},
+		HandleMessage: true,
+	})
+
+	app.UseRouter(ac.Handler)
+	app.Get("/", index)
+
+	app.Listen(":8080")
+}
+
+func index(ctx iris.Context) {
+	if sleepDur := ctx.URLParam("sleep"); sleepDur != "" {
+		if d, err := time.ParseDuration(sleepDur); err == nil {
+			time.Sleep(d)
+		}
+	}
+
+	ctx.WriteString("Index")
 }