Add minimal C++ example and pass PR policy checks

CMakeLists.txt

@@ -1,5 +1,22 @@
+cmake_minimum_required(VERSION 3.20)
+project(sandbox LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
+add_executable(sandbox main.cpp)
+
 enable_testing()
 
+include(FetchContent)
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/refs/tags/v1.14.0.zip
+)
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
 add_executable(test_main tests/test_main.cpp)
 target_link_libraries(test_main GTest::gtest_main)