README.md: updated introduction

Author: vmagnin

README.md

@@ -1,8 +1,8 @@
 # cairo-fortran
 
-This repository contains the libcairo bindings for Fortran from the [gtk-fortran project](https://github.com/vmagnin/gtk-fortran/) available as a separate _fpm_ package. 
+This repository contains Fortran bindings for the [Cairo](https://cairographics.org/) vector graphics library. It was extracted from the [gtk-fortran](https://github.com/vmagnin/gtk-fortran/wiki/) project, as a separate _fpm_ package.
 
-Remark: it was cloned from the now unavailable @brocolis' repository (latest 5th September 2021 version).
+Remark: this repository was cloned from the now unavailable @brocolis' repository (latest 5th September 2021 version).
 
 ## Requirements and dependencies