feat: implement initial version

.gitignore

.gitlab-ci.yml

.helmignore

Chart.yaml

LICENSE.md

templates/_helpers.tpl

templates/certificate.yaml

templates/configmap-admin.yaml

templates/configmap-front.yaml

templates/configmap-global.yaml

templates/configmap-smtp.yaml

templates/daemonset-front.yaml

templates/deploy-admin.yaml

templates/deploy-antispam.yaml

templates/deploy-imap.yaml

templates/deploy-smtp.yaml

templates/deploy-webdav.yaml

templates/ingress-admin.yaml

templates/ingress-antispam.yaml

templates/ingress-webdav.yaml