Add project files

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+project(acrux_coroutines CXX)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Header-only module: no library target to build, just the include path.
+add_library(acrux_coroutines INTERFACE)
+add_library(acrux::coroutines ALIAS acrux_coroutines)
+
+target_include_directories(acrux_coroutines INTERFACE
+	$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+	$<INSTALL_INTERFACE:include>
+)
+
+target_compile_features(acrux_coroutines INTERFACE cxx_std_20)
+
+option(ACRUX_COROUTINES_BUILD_TEST "Build the test/example executable" ON)
+
+if(ACRUX_COROUTINES_BUILD_TEST)
+	enable_testing()
+	add_executable(acrux_coroutines_test test/coroutines/main.cpp)
+	target_link_libraries(acrux_coroutines_test PRIVATE acrux::coroutines)
+
+	if(NOT MSVC)
+		target_compile_options(acrux_coroutines_test PRIVATE -Wall -Wextra)
+	endif()
+
+	# The test writes an interactive "cutscene" to stdout and waits on
+	# std::cin.get() partway through -- pipe it some input so it can run
+	# unattended under ctest.
+	add_test(NAME acrux_coroutines_test
+		COMMAND ${CMAKE_COMMAND} -E env sh -c "printf '\\n\\n\\n' | $<TARGET_FILE:acrux_coroutines_test>")
+endif()