Start api directory, which will become a module.

api/types/pluginconfig.go

@@ -0,0 +1,16 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package types
+
+// PluginConfig holds plugin configuration.
+type PluginConfig struct {
+	// DirectoryPath is an absolute path to a
+	// directory containing kustomize plugins.
+	// This directory may contain subdirectories
+	// further categorizing plugins.
+	DirectoryPath string
+
+	// Enabled is true if plugins are enabled.
+	Enabled bool
+}