Add link to build examples

gpaw/README.md

@@ -42,6 +42,9 @@ accelerators, architecture specific instructions and requirements are also
 provided for [Xeon Phis](build/build-xeon-phi.md) and for
 [GPGPUs](build/build-cuda.md).
 
+Example [build scripts](build/examples/) are also available for some PRACE
+systems.
+
 
 Benchmarks
 ----------