feat: add ppm image loading

feat: add basic image functions

feat: add logger

feat: add input handling functions

feat: add display utils functions

fix: add compile commands to makefile

feat: add nonblocking io functions

feat: add cursor functions

feat: add main implementation

refactor: add lcd command macro

fix: remove missing variables from Makefile

feat: add gitignore

docs: add first description of image viewer

feat: add main Makefile

feat: create initial structure for image-viewer