Add doc for internal/gates package

Signed-off-by: Evans Mungai <mbuevans@gmail.com>

internal/gates/doc.go

@@ -0,0 +1,19 @@
+/*
+Copyright The Helm Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package gates contains internal feature gates that can be used to enable or disable experimental features.
+// This is a separate internal package instead of using the pkg/gates package to avoid circular dependencies.
+package gates