Add rollup

Author: Dan Schulte

rollup.config.js

@@ -0,0 +1,25 @@
+import sourcemaps from "rollup-plugin-sourcemaps";
+
+const banner = `/** @license ms-rest-azure-env
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ */`;
+
+/**
+ * @type {import('rollup').RollupFileOptions}
+ */
+export default {
+  input: './dist/lib/msRestNodeAuth.js',
+  external: [
+    "adal-node"
+  ],
+  output: {
+    file: "./dist/msRestNodeAuth.js",
+    format: "cjs",
+    sourcemap: true,
+    banner
+  },
+  plugins: [
+    sourcemaps()
+  ]
+};