Add script to create ASCII logos

I created a script that can generate an ASCII postmarketOS logo of almost any size (I recommend a height of at least 8).

Try it out!

usage: pmos_ascii_logo.py [-h] [--height HEIGHT] [--thickness THICKNESS]
                          [--gap GAP] [--escape]

Generate a postmarketOS logo in ASCII

optional arguments:
  -h, --help            show this help message and exit
  --height HEIGHT       height of logo, default 20
  --thickness THICKNESS
                        thickness of segments, default is scaled based on
                        height
  --gap GAP             size of gap between segments, default 1
  --escape              escape backslashes