chore: add transient history to gitignore

chore: move custom-setup.el to lisp/ subfolder

chore: add custom.el to .gitignore

The custom.el is a file that is created by customizing emacs.
Do not persist this file in repo, as if the option is meant to
persist, it should be set in corresponding part of init.el

chore: add gitignore

feat: no littering

feat: Initial commit

Initial working configuration