Add default setup for runner

.gitignore

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+config

README.md

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+# Register runner
+```
+docker run --rm -it -v $PWD/config:/etc/gitlab-runner gitlab/gitlab-runner register
+```
+
+Executor : `docker:19.03.12`

docker-compose.yml

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+version: "3.2"
+
+services:
+    runner:
+        image: gitlab/gitlab-runner:latest
+        container_name: gitlab_runner
+        restart: unless-stopped
+        volumes:
+            - /var/run/docker.sock:/var/run/docker.sock
+            - /opt/services:/opt/services
+            - ./config:/etc/gitlab-runner