Adds ansible playbook for foundry setup

Currently, running the playbook will:
- Install dependencies (Caddy, nodejs, unzip)
- Create a foundry user
- Extract foundry app into folder on server
- Update Caddyfile with reverse proxt config

TODO:
- unit file for foundry itself
- data directory

variables.yml.example

@@ -0,0 +1 @@
+domain_name: vtt.vidja.social