docs: add plugin setup guide

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

@@ -0,0 +1,14 @@
+#pragma once
+
+namespace RE::BSResource
+{
+	class Info
+	{
+	public:
+		// members
+		REX::W32::FILETIME modifyTime;  // 00
+		REX::W32::FILETIME createTime;  // 08
+		std::uint64_t      fileSize;    // 10
+	};
+	static_assert(sizeof(Info) == 0x18);
+}