Build without JSON #81
Description
Hi,
I am including this project as a dependency in an existing large codebase. That codebase has already included nlohmann_json via other means. This leads to a clash when this project's CMakeLists.txt unconditionally also fetches the library.
Could you do an OPTIONAL call to find_package before invoking fetchContent for the JSON library? Or would you accept a PR for this?
Thank you