cli: Add empty neofs-cli app structure

In the following release `neofs-cli` will be used to directly manage NeoFS Node.
All required definitions and interfaces are also moving from `neofs-api` to
`neofs-node` repository, so it's more convinient to have `neofs-cli` here.

Signed-off-by: Stanislav Bogatyrev <stanislav@nspcc.ru>

cmd/neofs-cli/modules/version.go

@@ -0,0 +1,47 @@
+package cmd
+
+import (
+	"encoding/json"
+	"fmt"
+	"github.com/nspcc-dev/neofs-node/misc"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	// versionCmd represents the version command
+	versionCmd = &cobra.Command{
+		Use:   "version",
+		Short: "Print version and exit",
+		Run:   versionRun,
+	}
+)
+
+var flagJSON bool
+
+type VersionInfo struct {
+	Version string `json:"Version,omitempty"`
+	Build   string `json:"Build,omitempty"`
+	Debug   string `json:"Debug,omitempty"`
+}
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+	versionCmd.Flags().BoolVarP(&flagJSON, "json", "j", false, "Print version information in JSON")
+}
+
+func versionRun(cmd *cobra.Command, args []string) {
+
+	versionInfo := VersionInfo{Version: misc.Version, Build: misc.Build, Debug: misc.Debug}
+
+	if flagJSON {
+		bytes, _ := json.Marshal(versionInfo)
+		fmt.Printf("%s", string(bytes)+"\n")
+		return
+	}
+
+	fmt.Printf("Version: %s \nBuild: %s \nDebug: %s\n",
+		versionInfo.Version,
+		versionInfo.Build,
+		versionInfo.Debug)
+}