docs: add plugin setup guide

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

@@ -0,0 +1,15 @@
+#pragma once
+
+namespace RE
+{
+	namespace NonMorphFaceManagement
+	{
+		class InstanceData
+		{
+		public:
+			// members
+			void* instanceData;  // 00
+		};
+		static_assert(sizeof(InstanceData) == 0x8);
+	}
+}