Added the ability to add nicknames for users (#2981)

Co-authored-by: Mm2PL <mm2pl+gh@kotmisia.pl>
Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/widgets/settingspages/NicknamesPage.hpp

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "widgets/helper/EditableModelView.hpp"
+#include "widgets/settingspages/SettingsPage.hpp"
+
+#include <QStringListModel>
+
+class QVBoxLayout;
+
+namespace chatterino {
+
+class NicknamesPage : public SettingsPage
+{
+public:
+    NicknamesPage();
+};
+
+}  // namespace chatterino