IVGCVSW-7330 Add end-to-end dynamic sample build steps

* Moving from other build guides which are being
  removed and/or consolidated. Provides steps on
  how to build the standalone backend unit tests
  using the build-tool.

Signed-off-by: James Conroy <james.conroy@arm.com>
Change-Id: I3994bffc9038632ab7271ac31db25a38157f2bb7