docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/H/hclTriangleBuffer.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "RE/H/hkBool.h"
+
+namespace RE
+{
+	class hclTriangleBuffer
+	{
+	public:
+		// members
+		const void*   m_bufferStart;       // 0x00
+		std::uint32_t m_numElements;       // 0x08
+		std::uint8_t  m_stride;            // 0x0C
+		hkBool        m_use16BitsIndices;  // 0x0D
+	};
+	static_assert(sizeof(hclTriangleBuffer) == 0x10);
+}