Add an examples/project1 with multiple files

examples/project1/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
+
+project(project1 C Fortran)
+
+add_executable(project1
+    project1.f90
+    a.f90
+    b.f90
+)

examples/project1/README.md

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+To compile with LFortran:
+
+    FC=lfortran cmake .
+
+To choose a backend:
+
+    FC=lfortran FFLAGS="--backend=cpp" cmake .
+    FC=lfortran FFLAGS="--backend=llvm" cmake .

examples/project1/a.f90

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+module a
+use b, only: g
+implicit none
+private
+public f, fib
+
+contains
+
+integer function f()
+f = 3 + g()
+end function
+
+subroutine fib(n)
+integer, intent(in) :: n
+integer :: i, a, b, c
+a = 1
+b = 1
+do i = 1, n-2
+    c = a+b
+    print *, "Fibonacci: ", i, " ", c
+    a = b;
+    b = c;
+end do
+end subroutine
+
+end module

examples/project1/b.f90

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+module b
+implicit none
+private
+public g
+
+contains
+
+integer function g()
+g = 5
+end function
+
+end module

examples/project1/project1.f90

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+program project1
+use a, only: f, fib
+implicit none
+
+if (f() /= 8) error stop
+
+call fib(10)
+
+print *, "OK"
+
+end