[nostalgia/studio] Actually add studio::Editor...

src/nostalgia/studio/lib/editor.cpp

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2016 - 2019 gtalent2@gmail.com
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include "editor.hpp"
+
+namespace nostalgia::studio {
+
+Editor::Editor(QWidget *parent): QWidget(parent) {
+}
+
+void Editor::save() {
+}
+
+QUndoStack *Editor::undoStack() {
+	return nullptr;
+}
+
+}