Add license agreement dialog

obs/window-license-agreement.hpp

@@ -0,0 +1,14 @@
+#pragma once
+
+#include <memory>
+#include "ui_OBSLicenseAgreement.h"
+
+class OBSLicenseAgreement : public QDialog {
+	Q_OBJECT
+
+private:
+	std::unique_ptr<Ui::OBSLicenseAgreement> ui;
+
+public:
+	OBSLicenseAgreement(QWidget *parent);
+};