Add software requirements

[lcolladotor]

I would add a section like ## Software requirements {-} below the citation information from #3 https://github.com/LieberInstitute/VisiumImgProcessing/blob/705329a25b21f818e62a3606fec4a7af1f757192/index.Rmd#L17 so you can explain what specific version of Matlab this code works on and any particular Matlab dependencies it might have.

If you also need about XX GB of RAM and/or multiple cores, I would mention that too. That will help set the expectations on what you need to have before you can use this software.