docs: re-add Servers tutorial and change code snippet

pages/docs/tutorials/getting-started/servers.md

@@ -0,0 +1,56 @@
+---
+title: "Servers"
+date: 2019-04-03T10:56:52+01:00
+menu:
+  docs:
+    parent: 'getting-started'
+weight: 110
+---
+
+In the previous lesson, you learned how to create the definition of a simple [Hello World application](/docs/getting-started/hello-world). Let's take it from there.
+
+In this tutorial, you'll learn how to add `servers` to your AsyncAPI document. Adding and defining servers is useful because it specifies where and how to connect. The connection facilitates where to send and receive messages.
+
+<CodeBlock highlightedLines={[6,7,8,9,10]}>
+{`asyncapi: 3.0.0
+info:
+  title: Hello world application
+  version: '0.1.0'
+servers:
+  production:
+    host: broker.mycompany.com
+    protocol: amqp
+    description: This is "My Company" broker.
+channels:
+  hello:
+    address: 'hello'
+    messages:
+      sayHelloMessage:
+        payload:
+          type: string
+          pattern: '^hello .+$'
+operations:
+  receiveHello:
+    action: 'receive'
+    channel:
+      $ref: '#/channels/hello'`}
+</CodeBlock>
+
+You've now added a new section called `servers` in your AsyncAPI document.
+
+You might have noticed that our example mentions `amqp`, a very common protocol that was popularized by RabbitMQ (among others). While our example uses `amqp`, you can use any protocol. The most common protocols used are `mqtt` (widely adopted by the Internet of Things and mobile apps), `kafka` (popular for its streaming solution), `ws` (WebSockets are frequently used in browsers), and `http` (used in HTTP streaming APIs).
+
+<Remember>
+
+The `servers` section defines where your application should connect to start sending and receiving messages. 
+
+1. If you are using a broker-centric architecture such as Kafka or RabbitMQ, specify the broker URL. 
+2. If you have the classic client-server model such as for REST APIs, then your `server` should be the URL of the server.
+
+</Remember>
+
+## Conclusion
+
+Now you know where the `Hello world application` connects to, and you can start receiving `hello {name}` messages.
+
+In the next section, you'll learn how to add security requirements to your server.