Add bash/powershell/zsh completions

Was this really necessary? No
Are there more important things to implement? Yes
Do I care? No

utils/utils.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	"github.com/comp500/packwiz/cmd"
+	"github.com/spf13/cobra"
+)
+
+// utilsCmd represents the base command when called without any subcommands
+var utilsCmd = &cobra.Command{
+	Use:   "utils",
+	Short: "Utilities for managing packwiz itself",
+}
+
+func init() {
+	cmd.Add(utilsCmd)
+}