add command line option to display application version

cmd/iffmaster/main.go

@@ -4,16 +4,38 @@
 /*
 Iffmaster is a tool to inspect IFF files as defined under EA-85.
 
-Usage:
+Usage: [options]
 
 	iffmaster
 
-There aren't any command line options yet.
+		-version: Show the application's version.
 */
 package main
 
-import "github.com/mattrust/iffmaster/internal/gui"
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/mattrust/iffmaster/internal/gui"
+)
+
+const version = "1.0.0"
 
 func main() {
-	gui.OpenGUI()
+	showVersion := flag.Bool("version", false, "Display the version of iffmaster")
+	flag.Parse()
+
+	if *showVersion {
+		fmt.Println("iffmaster version", version)
+		os.Exit(0)
+	}
+
+	if flag.NArg() > 0 {
+		//filename := flag.Arg(0)
+		//fmt.Println("Filename provided:", filename)
+		// You can add code here to handle the filename, e.g., open the file
+	} else {
+		gui.OpenGUI()
+	}
 }