tsk-1: Go version bump (#2)

Closes #1

Reviewed-on: #2
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

main.go

@@ -1,10 +1,22 @@
 package main
 
 import (
+	"flag"
 	"fmt"
+
+	"git.kundeng.us/phoenix/catapult/internal/version"
 )
 
+const App_Name = "catapult"
 
 func main() {
-	fmt.Println("catapult")
+	fmt.Println(App_Name)
+
+	versionFlag := flag.Bool("version", false, "Print version information")
+	flag.Parse()
+
+	if *versionFlag {
+		fmt.Println(version.String())
+		return
+	}
 }