get resolution

Would it be useful to add get_resolution like
```julia
function get_resolution(vPath)
    meta = FFMPEG.exe(`-v error -select_streams v:0 -show_entries stream=width,height -of csv=p=0 $vPath`, command=FFMPEG.ffprobe, collect=true)
    resplit = split( meta[1], ",")
    parse(Int,resplit[1]),parse(Int,resplit[2])
end
```
?