Added notes on vaultwarden

vaultwarden/README.md

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+# Vaultwarden
+
+I've set up vaultwarden on Frankie. Here are a few notes about it.
+
+
+## Hardening
+
+To prevent users from registering freely, activate the following env var:
+`SIGNUPS_ALLOWED=false`.
+
+To activate the admin panel, you need to add the admin token as an env var, 
+like this: `ADMIN_TOKEN=<the-very-safe-token>`. Afterwards, you can enter the
+admin panel by adding `/admin` in the URL.

vaultwarden/docker-compose.yaml

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+version: "2"
+services:
+    vaultwarden:
+        image: vaultwarden/server:latest
+        container_name: vaultwarden
+        restart: unless-stopped
+        environment:
+            - SIGNUPS_ALLOWED=false
+            - ADMIN_TOKEN=this-one-should-be-huge!!!
+        volumes:
+            - ./vw-data:/data/
+        ports:
+            - 6969:80