Fixing README.md

README.md

-This repository contains the benchmarks in QF_AUFBV logic.
+This is a repository of SMT-LIB benchmarks. See http://smtlib.org/ for more information about the SMT-LIB.
+
+This repository contains the benchmarks in QF_AUFBV logic. See http://smtlib.org/logics.shtml for a description of logics.
 
 To clone this repository on your computer, use the git command:
 
 git clone https://clc-gitlab.cs.uiowa.edu:2443/SMT-LIB-benchmarks/QF_AUFBV.git
 
-PLEASE do not use the download button on the top right, since it stresses our server for large repositories.
+PLEASE do not use the download button on the top right, since it stresses our server when used over large repositories.
+
+Zip files are available on the following page: http://smt-lib.loria.fr/zip/ .