Posterizing the Stairs
First of all I opened the original image in PhotoShop.
I then posterized the image by going to Image > Adjustments > Posterize and set it to 3.
I rotated the canvas by going to Image > Rotate Canvas > 90 CCW.
Double click on the Background Layer in the Layers Palette to unlock it. With your image layer still selected go to Filter > Artistic > Neon Glow and applied the following settings:
I then selected the Text Tool and chose the following settings:
Arial Narrow
Regular
4pt (very small)
Crisp
Colour - FFFFFF
I wrote out the text mind the gap. I then went to Edit > Transform > Rotate and then used the Move Tool to position as shown below.
This is the final result:
