Update README.md

README.md

@@ -1,2 +1,23 @@
 # crc
   crc16/crc32/crc64
+
+## Build
+
+``` bash
+git clone https://github.com/gityf/crc.git
+mkdir build
+cd build
+cmake .. -DBUILD_SHARED_LIBS=1
+make 
+```
+
+## Include 
+
+### Cmake build system 
+
+``` cmake
+add_subdirectory(crc)
+
+target_link_libraries(${PROJECT_NAME} PUBLIC crc)
+
+```