Save generated sound to file

[CodeFinder2]

Hi,

first of all, nice project!

Not an issue but a question / feature request: is it possible to store the generated sound in a file?

Thanks! :-)

EDIT: see my draft here https://github.com/CodeFinder2/pysinewave/commits/master I can create a PR if you are fine with it.

EDIT: changed the code a bit to be more flexible (it now allows to retrieve the collected data so that it can be stored in a (WAV) file by the user of the library).