docs: add R2Devops file

{{cookiecutter.project_slug}}/{{cookiecutter.template_name}}.r2.yml

+files:
+    template: ./templates/gitlab-ci-{{cookiecutter.project_slug}}.yml
+    documentation: ./README.md
+    changelog: ./CHANGELOG.md
+data:
+{%- if cookiecutter.template_type == 'build' %}
+    description: "Build, test and analyse your {{cookiecutter.template_name}} projects"
+    labels:
+    - to be continuous
+    - Build
+    - {{cookiecutter.template_name}}
+{%- elif cookiecutter.template_type == 'deploy' %}
+    description: "Deploy your application on {{cookiecutter.template_name}}"
+    labels:
+    - to be continuous
+    - Deploy
+    - {{cookiecutter.template_name}}
+{%- elif cookiecutter.template_type == 'acceptance' %}
+    description: "Run your automated tests with {{cookiecutter.template_name}}"
+    labels:
+    - to be continuous
+    - Test
+    - {{cookiecutter.template_name}}
+{%- endif %}
+    public: true
+    license: LGPL v3
+    deprecated: false