added buttons to the custom window frame

src/widgets/helper/titlebarbutton.hpp

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "widgets/helper/rippleeffectbutton.hpp"
+
+namespace chatterino {
+namespace widgets {
+class TitleBarButton : public RippleEffectButton
+{
+public:
+    enum Style { Minimize = 1, Maximize = 2, Unmaximize = 4, Close = 8, User = 16, Settings = 32 };
+
+    TitleBarButton();
+
+    Style getButtonStyle() const;
+    void setButtonStyle(Style style);
+
+protected:
+    virtual void paintEvent(QPaintEvent *) override;
+    virtual void resizeEvent(QResizeEvent *) override;
+
+private:
+    Style style;
+};
+}  // namespace widgets
+}  // namespace chatterino