Add initial finite state machine implementation

include/mtl/fsm.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <cstdint>
+
+namespace mtl {
+class fsm_event {
+private:
+public:
+};
+
+template <typename T>
+T fsm_state_instance;
+
+template <typename FSMType, typename InitState>
+class fsm {
+
+	FSMType* state = nullptr;
+
+protected:
+	virtual void react(const mtl::fsm_event& event) = 0;
+
+	virtual void entry() {}
+	virtual void exit() {}
+
+	template <typename T>
+	void change_state() {
+		state = &fsm_state_instance<T>;
+	}
+
+public:
+	fsm() {
+		state = &fsm_state_instance<InitState>;
+	}
+
+	template <typename T>
+	void dispatch(const T& event) {
+		state->react(event);
+	}
+};
+
+
+} // namespace mtl