Add command and instructions to view logs.

Makefile

@@ -52,6 +52,9 @@ down: ## Remove all service containers and networks
 destroy: ## Remove all devstack-related containers, networks, and volumes
 	./destroy.sh
 
+logs: ## View logs from containers running in detached mode
+	docker-compose logs -f
+
 pull: ## Update Docker images
 	docker-compose pull
 

README.md

@@ -94,6 +94,14 @@ Catalog/Course Discovery Service, you can run:
 make discovery-shell
 ```
 
+To see logs from containers running in detached mode, you can either use
+"Kitematic" (available from the "Docker for Mac" menu), or by running the
+following:
+
+```sh
+make logs
+```
+
 To reset your environment and start provisioning from scratch, you can run:
 
 ```sh