docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/D/DIALOGUE_DATA.h

@@ -0,0 +1,14 @@
+#pragma once
+
+namespace RE
+{
+	class DIALOGUE_DATA
+	{
+	public:
+		// members
+		std::int8_t   flags;    // 0
+		std::int8_t   type;     // 1
+		std::uint16_t subtype;  // 2
+	};
+	static_assert(sizeof(DIALOGUE_DATA) == 0x4);
+}