feat: first time setup

ui/dialog_first_setup.cpp

@@ -0,0 +1,23 @@
+#include "dialog_first_setup.h"
+#include "ui_dialog_first_setup.h"
+
+#include "main/NekoRay.hpp"
+
+DialogFirstSetup::DialogFirstSetup(QWidget *parent) : QDialog(parent), ui(new Ui::DialogFirstSetup) {
+    ui->setupUi(this);
+}
+
+DialogFirstSetup::~DialogFirstSetup() {
+    delete ui;
+}
+
+void DialogFirstSetup::onButtonClicked() {
+    auto s = sender();
+    if (s == ui->v2ray) {
+        done(NekoRay::CoreType::V2RAY);
+    } else if (s == ui->singbox) {
+        done(NekoRay::CoreType::SING_BOX);
+    } else {
+        done(-1);
+    }
+}