build: CMake directory structure

CMakeLists.txt

@@ -1,6 +1,5 @@
 cmake_minimum_required(VERSION 3.0)
-project(klotski)
-
 set(CMAKE_CXX_STANDARD 14)
+project(klotski)
 
-add_executable(klotski main.cc case.cc common.cc klotski.cc)
+add_subdirectory(src)

src/CMakeLists.txt

@@ -0,0 +1,7 @@
+cmake_minimum_required(VERSION 3.0)
+set(CMAKE_CXX_STANDARD 14)
+
+include_directories(${PROJECT_SOURCE_DIR}/include)
+
+aux_source_directory(${PROJECT_SOURCE_DIR}/src SRC)
+add_executable(klotski ${SRC})