Add CMakeLists.txt

* support building with cmake

CMakeLists.txt

@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.7)
+project(coio)
+
+add_library(${PROJECT_NAME}
+    coro.c
+    coio.c
+    coio_glib.c)
+
+add_custom_target(${PROJECT_NAME}_files SOURCES coioimpl.h)
+
+set_property(TARGET ${PROJECT_NAME} PROPERTY C_STANDARD 99)
+target_compile_options(${PROJECT_NAME} PRIVATE -W -Wall -Wextra -Werror)
+
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GLIB2 REQUIRED glib-2.0)
+
+target_include_directories(${PROJECT_NAME} PUBLIC ${GLIB2_INCLUDE_DIRS})
+target_link_libraries(${PROJECT_NAME} ${GLIB2_LIBRARIES})
+
+target_include_directories(${PROJECT_NAME} PUBLIC .)