Use a new file extension

[elbrujohalcon]

I would recommend something like *.nconf to distinguish from *.config files.

[igaray]

The main entry point to nconf's code is supplied with a filename which is passed to file:consult, i.e.

name_all() = string()
           | atom()
           | deep_list()
           | (RawFilename :: binary())

Should nconf enforce the extension?

[elbrujohalcon]

No, it should only be consistently mentioned in the documentation / README.md file, @igaray