docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/B/BSResource_Archive2_StreamOpenedEvent.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "RE/B/BSFixedString.h"
+
+namespace RE::BSResource
+{
+	namespace Archive2
+	{
+		class StreamOpenedEvent
+		{
+		public:
+			// members
+			BSFixedString streamName;     // 00
+			BSFixedString sourceName;     // 08
+			std::uint64_t startOffset;    // 10
+			std::uint32_t sizeInArchive;  // 18
+		};
+		static_assert(sizeof(StreamOpenedEvent) == 0x20);
+	}
+}