modify description field in description file

DESCRIPTION

@@ -1,7 +1,12 @@
 Package: pcr
 Version: 1.0.0
 Title: Analyzing Real-Time Quantitative PCR Data
-Description: Quality assessing, analyzing and testing the statistical significance of real-time quantitative PCR data.
+Description: Calculates the amplification efficiency and curves from real-time 
+  quntitative PCR (Polymerase Chain Reaction) data. Estimates the relative 
+  experssion from PCR data using the double delta CT and the statndard curve 
+  methods Livak & Schmittgen (2001) <doi:10.1006/meth.2001.1262>. Tests for 
+  statistical significance using two-group tests and linear regression 
+  Yuan et al. (2006) <doi: 10.1186/1471-2105-7-85>.
 Authors@R: person("Mahmoud", "Ahmded",
   email = "mahmoud.s.fahmy@students.kasralainy.edu.eg",
   role = c("aut", "cre"))

cran-comments.md

@@ -24,3 +24,17 @@ and only include the restrictions.
 We need add no restrictions to GPL-3 so The **License** field in `DESCRIPTION` 
 was modified to `GPL-3` and the `LICENSE` file was removed. 
 In addition, a file `cran-comments.md` was added to track comments.  
+
+* Second round
+
+> 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.  
+
+We rephrased the **Description** field of the `DESCRIPTION` file to elaborate 
+on the methods, explain the acronym PCR and add two references