ADD: added basic backend function plus a mockup for a cli interface

backend/cmd/cli/root/root.go

@@ -0,0 +1,25 @@
+package root
+
+import (
+	"fmt"
+	"os"
+	"studia/cmd/cli/user"
+
+	"github.com/spf13/cobra"
+)
+
+var RootCmd = &cobra.Command{
+	Use:   "myapp",
+	Short: "MyApp admin CLI",
+}
+
+func Execute() {
+	if err := RootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func init() {
+	RootCmd.AddCommand(user.UserCmd)
+}