docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/R/RepeaterData.h

@@ -0,0 +1,17 @@
+#pragma once
+
+namespace RE
+{
+	namespace TESSoundDefs
+	{
+		class RepeaterData
+		{
+		public:
+			// members
+			float minDelay;   // 0
+			float maxDelay;   // 4
+			bool  stackable;  // 8
+		};
+		static_assert(sizeof(RepeaterData) == 0xC);
+	}
+}