Add documentation for validate command

website/source/docs/cli/validate.html.md

@@ -0,0 +1,20 @@
+---
+layout: "docs"
+page_title: "vagrant validate - Command-Line Interface"
+sidebar_current: "cli-validate"
+description: |-
+  The "vagrant validate" command is used to validate your Vagrantfile.
+---
+
+# Up
+
+**Command: `vagrant validate`**
+
+This command validates your [Vagrantfile](/docs/vagrantfile/).
+
+## Examples
+
+```sh
+$ vagrant validate
+Vagrantfile validated successfully.
+```

website/source/layouts/docs.erb

@@ -62,6 +62,7 @@
             <li<%= sidebar_current("cli-status") %>><a href="/docs/cli/status.html">status</a></li>
             <li<%= sidebar_current("cli-suspend") %>><a href="/docs/cli/suspend.html">suspend</a></li>
             <li<%= sidebar_current("cli-up") %>><a href="/docs/cli/up.html">up</a></li>
+            <li<%= sidebar_current("cli-validate") %>><a href="/docs/cli/validate.html">validate</a></li>
             <li<%= sidebar_current("cli-version") %>><a href="/docs/cli/version.html">version</a></li>
             <li<%= sidebar_current("cli-nonprimary") %>><a href="/docs/cli/non-primary.html">More Commands</a></li>
             <li<%= sidebar_current("cli-machinereadable") %>><a href="/docs/cli/machine-readable.html">Machine Readable Output</a></li>