Add basic shaarli deployment

roles/shaarli/README.md

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+# shaarli
+
+A simple and fast bookmark manager.
+Can be deployed in minutes and takes minimum amount of resources.
+
+Be aware that shaarli installations can *not* be fully automated.
+That means after running this ansible role you will still have to setup up the first run wizard and create a user and so forth
+(if not running with an existing data-store).
+Do this quickly after setup,
+*especially* if your instance is public-facing!
+{: .alert .alert-warning}
+
+## Defaults
+
+```
+shaarli_upstream_file_dir: "{{ docker_stack_files_dir }}/{{ stack_name }}"
+```
+
+The on-target directory where the proxy configuration file should be stashed.
+
+```
+shaarli_use_https: true
+```
+
+Whether the service should be reachable through http (port 80) or through https (port 443) and provision an https certificate. Usually you will want this to stay `true`.
+
+```
+shaarli_version: latest
+```
+
+The docker image version to be used in stack creation.
+
+```
+subdomain_alias: links
+```
+
+If the deployed container should be served over a uri that is not the stack name. 
+By default, it will be set to `links.yourdomain.com` - 
+if this option is not set it will be served on `shaarli.yourdomain.com` instead.
+