docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/A/ACTOR_VALUE_MODIFIER.h

@@ -0,0 +1,11 @@
+#pragma once
+
+namespace RE
+{
+	enum class ACTOR_VALUE_MODIFIER : std::int32_t
+	{
+		kPermanent = 0,
+		kTemporary = 1,
+		kDamage = 2
+	};
+}