CRAN second round comments

[MahShaaban]

I received the following comments upon the second submission

Thanks, please elaborate in your description the used methods (e.g. which tests).
Please add a reference in the 'Description' field of your DESCRIPTION file reference in the form
authors (year) doi:...
authors (year) arXiv:...
authors (year, ISBN:...)
with no space after 'doi:', 'arXiv:' and angle brackets for auto-linking.
Please explain the acronym PCR in your description.
Please fix and resubmit.

[MahShaaban]

The following changes were made in response add4dc7 & a3a06de

• We rephrased the Description field of the DESCRIPTION file to elaborate
  on the methods, explain the acronym PCR and add two references
• Update the cran-comments.md