message: Reference GBE in readme
diff: @@ -6,6 +6,16 @@ focus on sparse solution of linear systems. It is implemented using modern C++
  implemented in CUDA.
  +Performance
  +-----------
  +
  +An extensive database of up-to-date benchmark results is available in the
  +[performance data reposotiry](https://github.com/ginkgo-project/ginkgo-data).
  +Visualizations of the database can be interactively generated using the
  +[Ginkgo Benchmark Explorer web application](https://ginkgo-project.github.io/ginkgo-benchmark-explorer).
  +The benchmark results are automatically updated using the CI system to always
  +reflect the current state of the library.
  +
  Prerequisites
  -------------
  @@ -163,7 +173,6 @@ run the following from the build folder:
  where `path/to/test` is the path returned by `make test`.
  -
  ### Installing Ginkgo
  To install Ginkgo into the specified folder, execute the following command in
  