feat(node): nats.io, open source messaging system (#301)

Signed-off-by: Nicolas Lamirault <nicolas.lamirault@gmail.com>

diagrams/onprem/queue.py

@@ -20,6 +20,10 @@ class Kafka(_Queue):
     _icon = "kafka.png"
 
 
+class Nats(_Queue):
+    _icon = "nats.png"
+
+
 class Rabbitmq(_Queue):
     _icon = "rabbitmq.png"
 

docs/nodes/onprem.md

@@ -181,6 +181,7 @@ Node classes list of onprem provider.
 - **diagrams.onprem.queue.Activemq**, **ActiveMQ** (alias)
 - **diagrams.onprem.queue.Celery**
 - **diagrams.onprem.queue.Kafka**
+- **diagrams.onprem.queue.Nats**
 - **diagrams.onprem.queue.Rabbitmq**, **RabbitMQ** (alias)
 - **diagrams.onprem.queue.Zeromq**, **ZeroMQ** (alias)