Add documentation for port command

website/docs/source/layouts/layout.erb

@@ -104,6 +104,7 @@
 									<li<%= sidebar_current("cli-login") %>><a href="/v2/cli/login.html">login</a></li>
 									<li<%= sidebar_current("cli-package") %>><a href="/v2/cli/package.html">package</a></li>
 									<li<%= sidebar_current("cli-plugin") %>><a href="/v2/cli/plugin.html">plugin</a></li>
+									<li<%= sidebar_current("cli-port") %>><a href="/v2/cli/port.html">port</a></li>
 									<li<%= sidebar_current("cli-powershell") %>><a href="/v2/cli/powershell.html">powershell</a></li>
 									<li<%= sidebar_current("cli-provision") %>><a href="/v2/cli/provision.html">provision</a></li>
 									<li<%= sidebar_current("cli-rdp") %>><a href="/v2/cli/rdp.html">rdp</a></li>

website/docs/source/v2/cli/port.html.md

@@ -0,0 +1,35 @@
+---
+page_title: "vagrant port - Command-Line Interface"
+sidebar_current: "cli-port"
+---
+
+# Port
+
+**Command: `vagrant port`**
+
+The port command displays the full list of guest ports mapped to the host
+machine ports:
+
+```
+$ vagrant port
+    22 (guest) => 2222 (host)
+    80 (guest) => 8080 (host)
+```
+
+In a multi-machine Vagrantfile, the name of the machine must be specified:
+
+```
+$ vagrant port my-machine
+```
+
+## Options
+
+* `--guest PORT` - This displays just the host port that corresponds to the
+  given guest port. If the guest is not forwarding that port, an error is
+  returned. This is useful for quick scripting, for example:
+
+        $ ssh -p $(vagrant port --guest 22)
+
+* `--machine-readable` - This tells Vagrant to display machine-readable output
+  instead of the human-friendly output. More information is available in the
+  [machine-readable output](/v2/cli/machine-readable.html) documentation.