docs: add plugin setup guide

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

@@ -0,0 +1,20 @@
+#pragma once
+
+namespace RE
+{
+	class hkStopwatch
+	{
+	public:
+		hkStopwatch() = default;
+
+		// members
+		std::int64_t m_ticksAtStart{ 0 };     // 0x00
+		std::int64_t m_ticksTotal{ 0 };       // 0x08
+		std::int64_t m_ticksAtSplit{ 0 };     // 0x10
+		std::int64_t m_splitTotal{ 0 };       // 0x18
+		hkBool       m_runningFlag{ false };  // 0x20
+		std::int32_t m_numTimings{ 0 };       // 0x24
+		const char*  m_name{ nullptr };       // 0x28
+	};
+	static_assert(sizeof(hkStopwatch) == 0x30);
+}