actually add vendor folder

vendor/raylib-cpp/CMakeLists.txt

@@ -0,0 +1,35 @@
+cmake_minimum_required(VERSION 3.11)
+set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
+project (raylib_cpp
+    VERSION 5.0.2
+    DESCRIPTION "raylib-cpp C++ Object Oriented Wrapper for raylib"
+    HOMEPAGE_URL "https://github.com/robloach/raylib-cpp"
+    LANGUAGES C CXX
+)
+
+# Options
+if ("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
+    set(RAYLIB_CPP_IS_MAIN TRUE)
+else()
+    set(RAYLIB_CPP_IS_MAIN FALSE)
+endif()
+option(BUILD_RAYLIB_CPP_EXAMPLES "Examples" ${RAYLIB_CPP_IS_MAIN})
+
+# Include Directory
+add_subdirectory(include)
+
+# Examples
+if(BUILD_RAYLIB_CPP_EXAMPLES)
+    add_subdirectory(examples)
+    set(BUILD_RAYLIB_CPP_STATIC ON)
+
+    # Testing
+    include(CTest)
+    enable_testing()
+    if(BUILD_TESTING)
+        set(CTEST_CUSTOM_TESTS_IGNORE
+            pkg-config--static
+        )
+        add_subdirectory(tests)
+    endif()
+endif()