Added cmake
Added cmake

CMakeLists.txt is usually placed in the root folder, this is a basic
cmake file that will do everything nessesary to build the program as
either as a library of another program or by itself.

CoolProp/CoolProp,CoolProp/CoolProp,JonWel/CoolProp,JonWel/CoolProp,dcprojects/CoolProp,dcprojects/CoolProp,dcprojects/CoolProp,henningjp/CoolProp,henningjp/CoolProp,dcprojects/CoolProp,dcprojects/CoolProp,DANA-Laboratory/CoolProp,JonWel/CoolProp,DANA-Laboratory/CoolProp,DANA-Laboratory/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,dcprojects/CoolProp,CoolProp/CoolProp,DANA-Laboratory/CoolProp,DANA-Laboratory/CoolProp,DANA-Laboratory/CoolProp,CoolProp/CoolProp,dcprojects/CoolProp,JonWel/CoolProp,JonWel/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,DANA-Laboratory/CoolProp,henningjp/CoolProp,henningjp/CoolProp,henningjp/CoolProp,JonWel/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,JonWel/CoolProp,CoolProp/CoolProp