Add basic usage example

cmd/basic_usage/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+import "git.smith.eu/m/go-agwpe"
+
+func main() {
+	engine := agwpe.NewPacketEngine("172.16.0.4:8000")
+
+	err := engine.Connect()
+	if err != nil {
+		fmt.Printf("Error connecting: %v\n", err)
+	}
+	defer engine.Disconnect()
+
+	version := engine.Version()
+	fmt.Printf("AGWPE version: %s\n", version)
+
+	frame := agwpe.NewVersionFrame()
+	frameData, err := frame.Serialize()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Serialization error: %v\n", err)
+	}
+
+	err = engine.Send(frameData)
+	if err != nil {
+		fmt.Println("Error:", err)
+	}
+
+	for msg := range engine.Messages {
+		major_verion := (uint16(msg[37]) << 8) | uint16(msg[36])
+		minor_verion := (uint16(msg[41]) << 8) | uint16(msg[40])
+		fmt.Printf("AGWPE version: %d.%d\n", major_verion, minor_verion)
+	}
+}