Create core structure

src/CMakeLists.txt

@@ -0,0 +1,9 @@
+add_library(qengine
+        black_scholes.cpp
+        monte_carlo.cpp
+        payoff.cpp
+        main.cpp
+)
+
+target_include_directories(qengine PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+target_link_libraries(qengine Eigen3::Eigen)