Project structure and UML first draft

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14)
+project(src)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake_modules" ${CMAKE_MODULE_PATH})
+
+add_subdirectory(src)
+add_subdirectory(tests)
+
+# Detect and add SFML
+find_package(SFML COMPONENTS system window graphics network audio REQUIRED)
+if(NOT SFML_FOUND)
+    message(FATAL_ERROR "SFML could not be found")
+endif()
+
+# Detect and add GTest
+find_package(GTest REQUIRED)
+if(GTest_FOUND)
+    enable_testing()
+else()
+    message(FATAL_ERROR "GTest could not be found")
+endif()
+
+# Find PugiXML
+find_path(PugiXML_INCLUDE_DIR pugixml.hpp)
+if(NOT IS_DIRECTORY ${PugiXML_INCLUDE_DIR})
+    message(FATAL_ERROR "PugiXML could not be found")
+endif()