add demo ipynb for r
add demo ipynb for r

MIT-LCP/mimic-code,MIT-LCP/mimic-code-sharing,fereshteh-razmi/mimic-code,MIT-LCP/mimic-code,MIT-LCP/mimic-code,fereshteh-razmi/mimic-code,MIT-LCP/mimic-code-sharing,fereshteh-razmi/mimic-code