step 1: skeleton - go module, CLI stub with --version, structure

cmd/verstak/main.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+const version = "0.1.0-dev"
+
+func main() {
+	if len(os.Args) < 2 {
+		fmt.Println("Verstak", version)
+		os.Exit(0)
+	}
+
+	switch os.Args[1] {
+	case "--version", "-v":
+		fmt.Println("Verstak", version)
+	case "--help", "-h":
+		fmt.Println("Verstak — local-first working vault")
+		fmt.Println()
+		fmt.Println("Usage: verstak <command> [flags]")
+		fmt.Println()
+		fmt.Println("Commands:")
+		fmt.Println("    init      Initialize a new vault")
+		fmt.Println("    --version Show version")
+		fmt.Println("    --help    Show this help")
+	case "init":
+		fmt.Println("TODO: init command (step 2)")
+	default:
+		fmt.Fprintf(os.Stderr, "Unknown command: %s\n", os.Args[1])
+		os.Exit(1)
+	}
+}