Add my function

I've created the `markembling` function, which generates a random colour and (optionally and by default) prints it out in standard hex form (e.g. `#F5837D`). This is called from a random point in `__main__`, as I'm not 100% sure what's going on in all that.

I have also fixed the call to gardaud's function, which mistakenly had extra brackets that killed it.