Update README_ACC.md

quantum_espresso/README_ACC.md

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 ## 1. Introduction
-The GPU-enabled version of Quantum Espresso (known as QE-GPU) provides
-GPU acceleration for the  Plane-Wave Self-Consistent Field (PWscf)
-code and energy barriers and reaction pathways through the Nudged
-Elastic Band method (NEB) package. QE-GPU is developed as a sort of  
-plugin to the main QE program branch and is based on code usually one
-or two versions behind the main program version. Note that in the
-accelerated benchmark suite, *version 5.4* has been used for QE-GPU
-whereas the latest release version of the main package is 6.0. 
-QE-GPU is developed by Filippo Spiga and the download and build
-instructions for the package are given here [1] if the packages is not
-already available on your system.  
+The GPU port of Quantum Espresso is a version of the program which has been 
+completely re-written in CUDA FORTRAN by Filippo Spiga. The version program used in these
+experiments is v6.0, even though further versions becamse available later during the 
+activity. 
 
 ## 2. Requirements