Rename serializer extension and set up build scripts

extensions/ipynb/src/ipynbMain.ts

@@ -0,0 +1,13 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+import { registerNotebookSerializer } from './serializer';
+
+export function activate(context: vscode.ExtensionContext) {
+	registerNotebookSerializer(context);
+}
+
+export function deactivate() { }