Add examples for compilation

examples/compilationWithLibrary/main.F90

+! Main program
+program main
+  use iso_fortran_env, only: di=>int64, dp=>real64
+  use saxpy_mod
+  integer nmax 
+  parameter (nmax=1000000)
+  real(dp) x(nmax), y(nmax), z(nmax)
+  real(dp) rate
+  integer(di) :: startc, endc
+
+  z=0._dp
+  x=1._dp
+  y=2._dp
+  
+  call system_clock(count_rate=rate)
+  call system_clock(startc)
+  call saxpy(nmax, 2.0_dp, x, y, z)
+  call system_clock(endc)
+  print*, "L2 norm of z = ",norm2(z)
+  write(*,*) "timing for saxpy: ", real(endc-startc, dp)/rate*1000, "ms"
+end program main

examples/simpleCompilation/saxpy.F90

+! saxpy routine
+module saxpy_mod
+  use iso_fortran_env, only: di=>int64, dp=>real64
+contains 
+subroutine saxpy(n, a, x, y, z)
+  integer, intent(in) :: n
+  real(dp), intent(in) :: x(:), y(:), a
+  real(dp), intent(out) :: z(:)
+  integer :: i
+
+  do i=1,n
+     z(i) = a*x(i)+y(i)
+  enddo
+end subroutine saxpy
+
+end module saxpy_mod
+
+! Main program
+program main
+  use iso_fortran_env, only: di=>int64, dp=>real64
+  use saxpy_mod
+  integer nmax 
+  parameter (nmax=100000000)
+  real(dp) x(nmax), y(nmax), z(nmax)
+  real(dp) rate
+  integer(di) :: startc, endc
+
+  z=0._dp
+  x=1._dp
+  y=2._dp
+  
+  call system_clock(count_rate=rate)
+  call system_clock(startc)
+  call saxpy(nmax, 2.0_dp, x, y, z)
+  call system_clock(endc)
+  print*, "L2 norm of z = ",norm2(z)
+  write(*,*) "timing for saxpy: ", real(endc-startc, dp)/rate*1000, "ms"
+end program main