feat: add castle tooltip

include/render/gui/CastleTooltip.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "GuiWidget.h"
+
+namespace td {
+
+namespace game {
+
+class TeamCastle;
+
+} // namespace game
+
+namespace gui {
+
+class CastleTooltip : public GuiWidget {
+private:
+    const game::TeamCastle* m_Castle;
+public:
+    CastleTooltip(client::Client* client);
+
+    virtual void render();
+
+    void setCastle(const game::TeamCastle* castle) { m_Castle = castle; }
+};
+
+} // namespace gui
+} // namespace td