feat(updater): tie in part 2, let there be UI!

Signed-off-by: Rachel Powers <508861+Ryex@users.noreply.github.com>

launcher/ui/dialogs/UpdateAvailableDialog.h

@@ -0,0 +1,49 @@
+// SPDX-FileCopyrightText: 2023 Rachel Powers <508861+Ryex@users.noreply.github.com>
+//
+// SPDX-License-Identifier: GPL-3.0-only
+
+/*
+ *  Prism Launcher - Minecraft Launcher
+ *  Copyright (C) 2023 Rachel Powers <508861+Ryex@users.noreply.github.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+#pragma once
+
+#include <QDialog>
+
+namespace Ui {
+class UpdateAvailableDialog;
+}
+
+class UpdateAvailableDialog : public QDialog {
+    Q_OBJECT
+
+   public:
+    
+    enum DialogCode {
+        Install,
+        DontInstall,
+        Skip,
+    };
+    
+    explicit UpdateAvailableDialog(const QString& currentVersion,
+                                   const QString& availableVersion,
+                                   const QString& releaseNotes,
+                                   QWidget* parent = 0);
+    ~UpdateAvailableDialog();
+
+   private:
+    Ui::UpdateAvailableDialog* ui;
+};