feat: init support hgctl (#273)

Signed-off-by: bitliu <bitliu@tencent.com>

pkg/cmd/hgctl/root.go

@@ -0,0 +1,32 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hgctl
+
+import "github.com/spf13/cobra"
+
+// GetRootCommand returns the root cobra command to be executed
+// by hgctl main.
+func GetRootCommand() *cobra.Command {
+	rootCmd := &cobra.Command{
+		Use:               "hgctl",
+		Long:              "A command line utility for operating Higress",
+		SilenceUsage:      true,
+		DisableAutoGenTag: true,
+	}
+
+	rootCmd.AddCommand(newVersionCommand())
+
+	return rootCmd
+}