Please provide examples in --help and README.md about mons

[Ventto]

Hi @Nowaker,
Thanks for the feedback.

I think throw your comment that the usage is a bit confusing.
The -S option appears in the More monitors section but it is meant to select exclusively two monitor among several and places both of them.

So you can only use this option as following: mons -S 1,0:R but not mons -S 1,0:R,2:R where you are trying to place a third monitor.

[FichteFoll]

I ran into the same pitfall and only found out how this option is supposed to be used after reading the readme. It was not obvious to me that we are supposed to use the numbers to refer to monitors from the --help usage information.

I can see now that it mentions using "monitor ids" and that the --primary option refers to a monitor name, but it is not explained what this "id" is since the name is also unique and used as the identifier for xrandr operations, for example.