Fix PROJECT() defined before minimum required cmake version

[NathanaelAtEGR]

CMake said:

CMake Warning (dev) at CMakeLists.txt:3 (PROJECT):
  cmake_minimum_required() should be called prior to this top-level project()
  call.  Please see the cmake-commands(7) manual for usage documentation of
  both commands.
This warning is for project developers.  Use -Wno-dev to suppress it.