add "add-default-config" flag

Signed-off-by: Hadi <112569860+anotherhadi@users.noreply.github.com>

internal/config/config.go

@@ -74,6 +74,16 @@ func Load(path string) error {
 	return viper.Unmarshal(Global)
 }
 
+func WriteDefaultConfig(path string) error {
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		return fmt.Errorf("create config dir: %w", err)
+	}
+	if err := os.WriteFile(path, defaultConfig, 0o644); err != nil {
+		return fmt.Errorf("write config: %w", err)
+	}
+	return nil
+}
+
 func ExpandPath(p string) string {
 	if strings.HasPrefix(p, "~/") {
 		home, err := os.UserHomeDir()