Add cobra commands and update project folder structure

cmd/git-list/main.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+var cmd = &cobra.Command{
+	Use:   "git-list",
+	Short: "git list",
+}
+
+func Execute() {
+	if err := cmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
+
+func main() {
+	Execute()
+}