message: Add static build instructions.
diff: @@ -24,6 +24,8 @@ mkdir build && cd build
  cmake -DCMAKE_CXX_COMPILER=hcc ..
  ```
  +A static library can be compiled by using the option `-DBUILD_SHARED_LIBS=off`
  +
  rocfft-rider is a client which will run general transforms and is
  useful for performance analysis. Compilation is enabled via the
  `-DBUILD_CLIENTS_RIDER=on` cmake option. rocfft-rider uses boost
  