Add support for nxxm.

[nxxm](https://nxxm.github.io)

include/ftxui/component/screen_interactive.hpp

@@ -0,0 +1,51 @@
+#ifndef FTXUI_COMPONENT_SCREEN_INTERACTIVE_HPP
+#define FTXUI_COMPONENT_SCREEN_INTERACTIVE_HPP
+
+#include <condition_variable>
+#include <functional>
+#include <memory>
+#include <mutex>
+#include <queue>
+#include <atomic>
+
+#include "ftxui/component/event.hpp"
+#include "ftxui/screen/screen.hpp"
+
+namespace ftxui {
+class Component;
+
+class ScreenInteractive : public Screen {
+  public:
+    static ScreenInteractive FixedSize(int dimx, int dimy);
+    static ScreenInteractive Fullscreen();
+    static ScreenInteractive FitComponent();
+    static ScreenInteractive TerminalOutput();
+
+    ~ScreenInteractive();
+    void Loop(Component*);
+    std::function<void()> ExitLoopClosure();
+
+    void PostEvent(Event event);
+
+  private:
+   void Draw(Component* component);
+   void EventLoop(Component* component);
+
+   enum class Dimension {
+     FitComponent,
+     Fixed,
+     Fullscreen,
+     TerminalOutput,
+   };
+   Dimension dimension_ = Dimension::Fixed;
+   ScreenInteractive(int dimx, int dimy, Dimension dimension);
+
+   std::condition_variable events_queue_wait;
+   std::mutex events_queue_mutex;
+   std::queue<Event> events_queue;
+   std::atomic<bool> quit_ = false;
+};
+
+}  // namespace ftxui
+
+#endif /* end of include guard: FTXUI_COMPONENT_SCREEN_INTERACTIVE_HPP */