docs: add plugin setup guide

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

@@ -0,0 +1,15 @@
+#pragma once
+
+namespace RE
+{
+	class hclVectorBuffer
+	{
+	public:
+		// members
+		void*         m_bufferStart;  // 0x00
+		std::uint32_t m_numElements;  // 0x08
+		std::uint8_t  m_stride;       // 0x0C
+		std::uint32_t m_flags;        // 0x10
+	};
+	static_assert(sizeof(hclVectorBuffer) == 0x18);
+}