update cmake for linear2d_layer

Author: OneAdder

CMakeLists.txt

@@ -36,6 +36,8 @@ add_library(neural-fortran
   src/nf/nf_layer_constructors_submodule.f90
   src/nf/nf_layer.f90
   src/nf/nf_layer_submodule.f90
+  src/nf/nf_linear2d_layer.f90
+  src/nf/nf_linear2d_layer_submodule.f90
   src/nf/nf_loss.f90
   src/nf/nf_loss_submodule.f90
   src/nf/nf_maxpool2d_layer.f90