Add examples to cmake project

asio/src/examples/CMakeLists.txt

@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.25...3.31)
+
+project(asio_examples LANGUAGES CXX)
+
+if(PROJECT_IS_TOP_LEVEL)
+  find_package(asio 1.32.0.1 EXACT REQUIRED)
+  enable_testing()
+endif()
+
+set(ALL_EXAMPLES callback_wrapper)
+
+message(STATUS "Examples to be built: ${ALL_EXAMPLES}")
+
+foreach(example ${ALL_EXAMPLES})
+  add_executable(${example})
+  target_sources(${example} PRIVATE cpp20/operations/${example}.cpp)
+  target_link_libraries(${example} asio::asio_header)
+  add_test(NAME ${example} COMMAND echo Test | ${example})
+endforeach()