docs: Add slash command example

examples/slash-cmd/main.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+
+	"github.com/shomali11/slacker"
+)
+
+// Implements a simple slash command. Assumes you have the slash command
+// `/ping` defined for your app.
+
+func main() {
+	bot := slacker.NewClient(
+		os.Getenv("SLACK_BOT_TOKEN"),
+		os.Getenv("SLACK_APP_TOKEN"),
+		slacker.WithDebug(true),
+	)
+
+	bot.Command("ping", &slacker.CommandDefinition{
+		Handler: func(botCtx slacker.BotContext, request slacker.Request, response slacker.ResponseWriter) {
+			response.Reply("pong")
+		},
+		HideHelp: true,
+	})
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	err := bot.Listen(ctx)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+}