Another example font3x5.bin to show text writing

I have your example for 5x8 text size, but unable to use it and need 3x5. I can create binary representations of the letters, but unsure how to put it in a .bin file or how you created the font5x8.bin file. Can you either explain the steps to create .bin files you used or post a font3x5.bin in the folder as another example please? Thank you!