docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/P/PlayerAmmoCounts.h

@@ -0,0 +1,13 @@
+#pragma once
+
+namespace RE
+{
+	class PlayerAmmoCounts
+	{
+	public:
+		// members
+		std::uint32_t clipAmmo;     // 00
+		std::uint32_t reserveAmmo;  // 04
+	};
+	static_assert(sizeof(PlayerAmmoCounts) == 0x8);
+}