Add version flag

cmd/version.go

@@ -0,0 +1,27 @@
+/*
+Copyright (c) Yankee Maharjan 2022. All rights reserved.
+Licensed under the MIT license. See LICENSE file in the project root for full license information.
+*/
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+var Version = "development"
+
+var versionCmd = &cobra.Command{
+	Use:     "version",
+	Short:   "Shows the application version",
+	Long:    `Show the applicaton version`,
+	Example: "st version",
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Println("Version:", Version)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+}