added support of the cmake build system

.gitignore

@@ -0,0 +1,28 @@
+# C++ objects and libs
+*.slo
+*.lo
+*.o
+*.a
+*.la
+*.lai
+*.so
+*.dll
+*.dylib
+
+# cmake
+
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps
+
+
+# git 
+*.orig

CMakeLists.txt

@@ -0,0 +1,30 @@
+if(DEFINED CRC_LIBRARY)
+  return()
+else()
+  set(CRC_LIBRARY 1)
+  add_definitions(-DCRC_LIBRARY)
+endif()
+
+project(CRC)
+
+if(TARGET ${PROJECT_NAME})
+  message("The ${PROJECT_NAME} arledy included in main Project")
+  return()
+endif()
+
+cmake_minimum_required(VERSION 3.1)
+
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+option(BUILD_SHARED_LIBS "Enable or disable shared libraries" OFF)
+
+file(GLOB SOURCE_CPP
+ 	"crc/*.h"
+    "crc/*.cpp"
+    "crc/*.c"
+)
+
+add_library(${PROJECT_NAME} ${SOURCE_CPP})
+
+