Add docstrings

[scottclowe]

It would be great if you could add docstrings to read_roi_file and read_roi_zip. That would make it a lot easier to work with the package.

[hadim]

I agree with you and thanks for opening the issue. Will try to do that at some points.

[dipanjanbhattacharya]

Hi ,

i faced with this error in opening zip roi file

UnboundLocalError: local variable 'channel' referenced before assignment

[scottclowe]

Hi, @dipanjanbhattacharya.
Could you please:

1. Open a new issue (https://github.com/hadim/read-roi/issues/new) to report this
2. Provide the full stack trace for the error, showing line numbers.
3. If you could also share a copy of the ROI file you are trying to open, that would help a lot.

Thanks!