A demo for accelerating sobel in xilinx's fpga pynq

#the bitstream path (The name of .tcl must be same as the name of .bit)
overlay = Overlay("/home/xilinx/jupyter_notebooks/sobel/sobel.bit")
#image path
orig_img_path = "/home/xilinx/jupyter_notebooks/sobel/test_1080p.bmp"
*rebuild this prj reference:vivado repo
