Updates to the README document

Initial commit of a new library that provides procedural use of funct…

…ionality from my Complex numbers library; separated out because I just got so fe up with the constant moans and complaints of people that object to the fact that PHP can't autoload functions/files, which meant that it required a files entry in the autoload section of the composer file.

So I get now have to maintain a third branch in the main Complex library, plus this additional repository... but as long as the entitled ones are happy, the reduction in my lready minimal free time, and the state of my mental health, are a small price to pay (as far as they are concerned)