docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/M/MenuControls.h

@@ -0,0 +1,51 @@
+#pragma once
+
+#include "RE/B/BSInputEventReceiver.h"
+#include "RE/B/BSTArray.h"
+#include "RE/B/BSTSingleton.h"
+#include "RE/S/ScreenshotHandler.h"
+
+namespace RE
+{
+	class BSInputEventUser;
+	class CameraZoomHandler;
+	class ClickHandler;
+	class DisconnectHandler;
+	class GFxConvertHandler;
+	class MenuOpenHandler;
+	class PipboyHandler;
+	class QuickSaveLoadHandler;
+
+	class MenuControls :
+		public BSInputEventReceiver,          // 00
+		public BSTSingletonSDM<MenuControls>  // 10
+	{
+	public:
+		[[nodiscard]] static MenuControls* GetSingleton()
+		{
+			static REL::Relocation<MenuControls**> singleton{ ID::MenuControls::Singleton };
+			return *singleton;
+		}
+
+		bool QueueScreenshot() const
+		{
+			if (!screenshotHandler || screenshotHandler->screenshotQueued) {
+				return false;
+			}
+			screenshotHandler->screenshotQueued = true;
+			return true;
+		}
+
+		// members
+		BSTArray<BSInputEventUser*> handlers;              // 18
+		GFxConvertHandler*          convertHandler;        // 30
+		DisconnectHandler*          disconnectHandler;     // 38
+		ClickHandler*               clickHandler;          // 40
+		QuickSaveLoadHandler*       quickSaveLoadHandler;  // 48
+		MenuOpenHandler*            menuOpenHandler;       // 50
+		ScreenshotHandler*          screenshotHandler;     // 58
+		CameraZoomHandler*          cameraZoomHandler;     // 60
+		PipboyHandler*              pipboyHandler;         // 68
+	};
+	static_assert(sizeof(MenuControls) == 0x70);
+}