website: document the inspect command

website/source/docs/command-line/inspect.html.markdown

+---
+layout: "docs"
+page_title: "Inspect - Command-Line"
+---
+
+# Command-Line: Inspect
+
+The `packer inspect` command takes a template and outputs the various components
+a template defines. This can help you quickly learn about a template without
+having to dive into the JSON itself.
+The command will tell you things like what variables a template accepts,
+the builders it defines, the provisioners it defines and the order they'll
+run, and more.
+
+This command is extra useful when used with
+[machine-readable output](/docs/command-line/machine-readable.html) enabled.
+The command outputs the components in a way that is parseable by machines.
+
+The command doesn't validate the actual configuration of the various
+components (that is what the `validate` command is for), but it will
+validate the syntax of your template by necessity.
+
+## Usage Example
+
+Given a basic template, here is an example of what the output might
+look like:
+
+```
+$ packer inspect template.json
+Variables and their defaults:
+
+  aws_access_key =
+  aws_secret_key =
+
+Builders:
+
+  amazon-ebs
+  amazon-instance
+  virtualbox
+
+Provisioners:
+
+  shell
+```

website/source/layouts/docs.erb

@@ -12,6 +12,7 @@
 			<li><a href="/docs/command-line/introduction.html">Introduction</a></li>
 			<li><a href="/docs/command-line/build.html">Build</a></li>
 			<li><a href="/docs/command-line/fix.html">Fix</a></li>
+			<li><a href="/docs/command-line/inspect.html">Inspect</a></li>
 			<li><a href="/docs/command-line/validate.html">Validate</a></li>
 			<li><a href="/docs/command-line/machine-readable.html">Machine-Readable Output</a></li>
 		</ul>