docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/B/BSTSingleton.h

@@ -0,0 +1,57 @@
+#pragma once
+
+namespace RE
+{
+	template <class T>
+	class BSTSingletonImplicit
+	{
+	public:
+		using value_type = T;
+	};
+
+	template <class T>
+	class BSTSingletonExplicit
+	{
+	public:
+		using value_type = T;
+	};
+
+	template <class T>
+	class BSTSingletonSDMOpStaticBuffer
+	{
+	public:
+		using value_type = T;
+	};
+
+	template <class Traits>
+	class BSTSingletonSDMBase :
+		public Traits,
+		public BSTSingletonSDMOpStaticBuffer<typename Traits::value_type>
+	{
+	public:
+	};
+
+	template <class T, class Buffer>
+	class BSTSDMTraits
+	{
+	public:
+		using value_type = T;
+	};
+
+#ifdef __EDG__
+	template <class T, template <class> class Buffer = BSTSingletonSDMOpStaticBuffer>
+	class BSTSingletonSDM
+	{
+	public:
+		std::uint8_t padding;
+	};
+#else
+	template <class T, template <class> class Buffer = BSTSingletonSDMOpStaticBuffer>
+	class BSTSingletonSDM :
+		public BSTSingletonSDMBase<BSTSDMTraits<T, Buffer<T>>>
+	{
+	public:
+		using value_type = T;
+	};
+#endif
+}