cli: add version command

Author: tbdsux

.github/workflows/ci.yml

@@ -45,4 +45,4 @@ jobs:
       - name: Build CLI binary
         run: go build -o rd-test ./rd/main.go
       - name: Verify CLI binary
-        run: ./rd-test
+        run: ./rd-test version

rd/cmd/version.go

@@ -0,0 +1,22 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+const VERSION = "v0.1.1"
+
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Show version information",
+	Long:  `Show version information of RealDebrid CLI tool.`,
+	Run: func(cmd *cobra.Command, args []string) {
+		fmt.Printf("%s\n", VERSION)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+}