Update README.md with instructions on how to restart background services (#104)

As part of the work done in Check-API CV2-6478, we removed inotify
and changed how we restart background services.

References: CV2-6468, CV2-6478, Check-API PR meedan/check-api#2340

Author: vasconsaurus

README.md

@@ -75,6 +75,7 @@ This is a [Docker Compose](https://docs.docker.com/compose/) configuration that
 - Update submodules to their latest commit and check if any example configuration files have been updated: `./bin/git-update.sh`
 - Pack your local config files: `./bin/tar-config.sh`
 - Restart a service, e.g. Check API: `docker-compose run api bash -c "touch tmp/restart.txt"`
+  - If you need to restart the background service as well, e.g. Check API background service, run: `docker compose restart api-background` (note that this will stop the containers if you used the flag `--abort-on-container-exit` to run the containers)
 - Invoke the Rails console on a service, e.g. Check API: `docker-compose run api bundle exec rails c d`
 - Update the Relay schema file on Check API: `docker-compose run api bundle exec rake lapis:graphql:schema`
 - Update the JSON API schema file on Check API: `docker-compose run api bundle exec rake jsonapi:resources:update_schema`