Cross Compilation for VIM3 board

@Frank

  1. Do you have any suggested cross compilor for VIM3 khadas board?
  2. When I was trying to compile the yolov3 code on Visual Studio, I encountered the following error.
    Can you please let me know where the '‘vsi_nn_pub.h’ file is located? I tried to find it in aml_npu_app and inside acuity toolkit. Yet, I could not find it.

@Akkisony Did you install VS on VIM3, or you PC ?

@Frank I installed the VS on my PC.

@Akkisony The source code for demo just support compile in VIM3.