Add all files changes

.gitignore

.stylelintignore

.stylelintrc.yml

README.md

gesso

gesso.breakpoints.yml

gesso.libraries.yml

gesso.theme

gesso_helper/gesso_helper.info.yml

gesso_helper/gesso_helper.services.yml

gesso_helper/src/TwigExtension/GessoExtensionAdapter.php

gesso_helper/src/TwigExtension/GessoExtensionLoader.php

images/arrow-down-white.svg

images/arrow-down.svg

images/arrow-up-white.svg

images/arrow-up.svg

images/correct.svg

images/home.svg

images/messages-error.svg

images/messages-status.svg