Add monica deployment

Added basic monica docker deployment.

A key which is required for monica is automatically generated on
deployment.
Optionally, geolocation and weather api can be enabled.
Mail-sending functionality is disabled by default but can be enabled
with any compatible smtp server set up.

roles/monica/meta/main.yml

@@ -0,0 +1,14 @@
+---
+
+galaxy_info:
+  author: Marty Oehme
+  description: Installs monica as a docker stack service
+  license: GPL-3.0-only
+  min_ansible_version: 2.9
+  galaxy_tags: []
+
+
+dependencies:
+  - docker
+  - docker-swarm
+  - caddy