docs: add plugin setup guide

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

@@ -0,0 +1,15 @@
+#pragma once
+
+namespace RE::BSResource
+{
+	class FileID
+	{
+	public:
+		[[nodiscard]] bool operator==(const FileID&) const noexcept = default;
+
+		// members
+		std::uint32_t file{ 0 };  // 0
+		std::uint32_t ext{ 0 };   // 4
+	};
+	static_assert(sizeof(FileID) == 0x8);
+}