Adding doc to v1 package

Signed-off-by: Johan Fylling <[email protected]>

v1/doc.go

@@ -0,0 +1,9 @@
+// Copyright 2016 The OPA Authors.  All rights reserved.
+// Use of this source code is governed by an Apache2
+// license that can be found in the LICENSE file.
+
+// Package v1 implements the v1 API for the Open Policy Agent (OPA).
+// The v1 API defaults to enforcing the v1 Rego syntax ([github.com/open-policy-agent/opa/v1/ast.RegoV1]).
+// Most packages outside the v1 API are deprecated. These constitute the older v0 API, which defaults to the v0 Rego syntax ([github.com/open-policy-agent/opa/v1/ast.RegoV0]).
+// The v0 API is provided as a means to ease transition to OPA 1.0 for 3rd party integrations, see [TODO: LINK TO V0 MIGRATION GUIDE].
+package v1