docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/S/SIT_SLEEP_STATE.h

@@ -0,0 +1,17 @@
+#pragma once
+
+namespace RE
+{
+	enum class SIT_SLEEP_STATE : std::int32_t
+	{
+		kNormal = 0x0,
+		kWantToSit = 0x1,
+		kWaitingForSitAnim = 0x2,
+		kIsSitting = 0x3,
+		kWantToStand = 0x4,
+		kWantToSleep = 0x5,
+		kWaitingForSleepAnim = 0x6,
+		kIsSleeping = 0x7,
+		kWantToWake = 0x8
+	};
+}