updated information files

.gitignore

 # ignore pdf files
 *.pdf
+
+# ignore build r package:
+sybil_*.tar.gz

README.md

-sybil
-=====
+#sybil - Efficient Constrained Based Modelling in R
 
-sybil - Efficient Constrained Based Modelling in R
+The package sybil is a Systems Biology Library for R, implementing algorithms for constraint based analyses of metabolic networks (e.g. flux-balance analysis (FBA), minimization of metabolic adjustment (MOMA), regulatory on/off minimization (ROOM), robustness analysis and flux variability analysis).
+
+Please consider downloading and installing the package via the R internal package management:
+install.packages("sybil")
+
+Alternatively you can visit the [CRAN pakage website](http://cran.r-project.org/web/packages/sybil/index.html).