docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/N/NiUpdateData.h

@@ -0,0 +1,18 @@
+#pragma once
+
+namespace RE
+{
+	class NiCamera;
+
+	class NiUpdateData
+	{
+	public:
+		// members
+		float         time{ 0.0f };        // 00
+		NiCamera*     camera{ nullptr };   // 08
+		std::uint32_t flags{ 0 };          // 10
+		std::uint32_t renderObjects{ 0 };  // 14
+		std::uint32_t fadeNodeDepth{ 0 };  // 18
+	};
+	static_assert(sizeof(NiUpdateData) == 0x20);
+}