azure: add Azure endpoints

Fixes #257.

Change-Id: I0fa087fd921256f03a0cd62a8ab559c5c63f4d0f
Reviewed-on: https://go-review.googlesource.com/79397
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

azure/azure.go

@@ -0,0 +1,16 @@
+// Copyright 2017 The oauth2 Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package azure provides constants for using OAuth2 to access Azure Active Directory (Azure AD).
+package azure
+
+import (
+	"golang.org/x/oauth2"
+)
+
+// Endpoint is the Azure Active Directory (Azure AD) OAuth 2.0 endpoint.
+var Endpoint = oauth2.Endpoint{
+	AuthURL:  "https://login.microsoftonline.com/common/oauth2/v2.0/authorize",
+	TokenURL: "https://login.microsoftonline.com/common/oauth2/v2.0/token",
+}