Add CMake build support

.gitignore

@@ -0,0 +1,3 @@
+.vscode/
+build/
+bin/

CMakeLists.txt

@@ -0,0 +1,27 @@
+cmake_minimum_required(VERSION 3.0.2)
+project(PS C)
+
+find_package(SDL2 REQUIRED)
+
+# set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mwindows -s")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -s")
+
+file(GLOB_RECURSE ${PROJECT_NAME}_SRC
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/**.c
+)
+
+include_directories(${SDL2_INCLUDE_DIRS})
+
+add_executable(${PROJECT_NAME} ${${PROJECT_NAME}_SRC})
+target_link_libraries(${PROJECT_NAME} ${SDL2_LIBRARIES})
+if(WIN32)
+    target_link_libraries(${PROJECT_NAME} imm32 winmm version setupapi hid)
+endif(WIN32)
+if(MINGW)
+    target_link_libraries(${PROJECT_NAME} imm32 winmm version setupapi hid samplerate)
+endif(MINGW)
+
+target_link_libraries(${PROJECT_NAME} ${SDL2_LIBRARIES} m)
+
+install(TARGETS ${PROJECT_NAME}
+    DESTINATION ${CMAKE_INSTALL_BINDIR})

README.md

@@ -3,6 +3,29 @@ All sounds and notes were entered manually without using any music programs.
 One single source file contains synth code, patterns and player.
 No third party libraries are used except SDL2 to output the audio stream.
 
+---
+Added support cmake build system.  
+
+Linux build: 
+``` 
+mkdir build && cd build
+cmake -G "Unix Makefiles" ..
+make
+```  
+MinGW32 or MXE CrossCompiling: 
+```
+mkdir build && cd build
+cmake -G "Unix Makefiles" .. -DCMAKE_TOOLCHAIN_FILE=Your-CrossCompiling-Toolchain-file.cmake
+make
+```
+
+Windows build:  
+```
+cmake -G "Visual Studio 16 2019" -A x64 -B "build"
+```
+Open .sln in Visual Studio... etc...  
+
+---
 Usage:
 * just play the song: `./ps`
 * export to WAV: `./ps -o filename.wav`