Create option pricing engine structure, test architecture.

src/Instrument.cpp

@@ -0,0 +1,17 @@
+//
+// Created by David Doebel  on 05.03.2026.
+//
+
+#include "Instrument.hpp"
+
+Instrument::Instrument(double maturity, std::unique_ptr<Payoff> payoff,
+    std::unique_ptr<PricingEngine> engine) : maturity_(maturity), payoff_(std::move(payoff)), engine_
+(std::move(engine)){
+}
+
+
+
+double Instrument::price() const {
+    return engine_->calculate(*this);
+}
+