Add debugging notes

README.md

@@ -17,7 +17,15 @@
 
 <!-- endmetadata -->
 
-## Quick start
+## Debug without abra
+
+- `docker swarm init`
+- `cp .env.sample .env`
+- `set -a && source .env`
+- Change values for `DOMAIN`, `STACK_NAME`, `PUBLIC_IPV4` and `EXTERNAL_IPV4` in `.env`
+- `docker stack deploy --detach=false -c compose.yml swarmtest`
+
+## Quick start (not working)
 
 * `abra app new bigbluebutton --secrets`
 * `abra app config <app-name>`