Light README update and CI configuration.

.gitlab-ci.yml

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+variables:
+  DOCKER_IMAGE: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/docker:20.10.8-dind
+  DOCKER_HOST: tcp://docker:2375
+  DOCKER_TCP_PORT: 2375
+  DOCKER_TLS_CERTDIR: ""
+  LINTTEST_IMAGE: ${CI_DEPENDENCY_PROXY_GROUP_IMAGE_PREFIX}/golangci/golangci-lint:v1.42.1
+  REGISTRY_IMAGE_LATEST: ${CI_REGISTRY_IMAGE}:latest
+  REGISTRY_IMAGE_TAGGED: ${CI_REGISTRY_IMAGE}:${CI_COMMIT_TAG}
+
+services:
+  - name: ${DOCKER_IMAGE}
+    alias: docker
+
+stages:
+  - test
+  - release
+
+lint:
+  stage: test
+  tags:
+    - docker
+  image: ${LINTTEST_IMAGE}
+  script:
+    - golangci-lint run
+
+build_master_image:
+    stage: release
+    only:
+        - master
+    tags:
+        - docker
+    image: ${DOCKER_IMAGE}
+    script:
+        - docker login -u ${CI_REGISTRY_USER} -p ${CI_REGISTRY_PASSWORD} ${CI_REGISTRY}
+        - docker build --pull -t ${REGISTRY_IMAGE_LATEST} --build-arg CI_COMMIT_TAG=${CI_COMMIT_TAG} --build-arg CI_COMMIT_REF_NAME=${CI_COMMIT_REF_NAME} --build-arg CI_COMMIT_SHA=${CI_COMMIT_SHA} --build-arg CI_PROJECT_NAME=${CI_PROJECT_NAME} .
+        - docker push ${REGISTRY_IMAGE_LATEST}
+
+build_tag_image:
+    stage: release
+    only:
+        - tags
+    tags:
+        - docker
+    image: ${DOCKER_IMAGE}
+    script:
+        - docker login -u ${CI_REGISTRY_USER} -p ${CI_REGISTRY_PASSWORD} ${CI_REGISTRY}
+        - docker build -t ${REGISTRY_IMAGE_TAGGED} --build-arg CI_COMMIT_TAG=${CI_COMMIT_TAG} --build-arg CI_COMMIT_REF_NAME=${CI_COMMIT_REF_NAME} --build-arg CI_COMMIT_SHA=${CI_COMMIT_SHA} --build-arg CI_PROJECT_NAME=${CI_PROJECT_NAME} .
+        - docker push ${REGISTRY_IMAGE_TAGGED}

README.md

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+# Periodicator
+
+A thing that do some things periodically.
+
+Initially created for periodic issues (or tasks) creation in Gitlab.
+
+## Installing
+
+There are several ways to install Periodicator.
+
+### Using binary release
+
+Head over releases page, grab your binary and configure your system to start binary using cron.
+
+### Using Docker image
+
+To be written :).
+
+## Configuring
+
+To be written :).