Add "audit" command documentation

website/source/docs/commands/audit.html.md

@@ -0,0 +1,57 @@
+---
+layout: "docs"
+page_title: "audit - Command"
+sidebar_current: "docs-commands-audit"
+description: |-
+  The "audit" command groups subcommands for interacting with Vault's audit
+  devices. Users can list, enable, and disable audit devices.
+---
+
+# audit
+
+The `audit` command groups subcommands for interacting with Vault's audit
+devices. Users can list, enable, and disable audit devices.
+
+For more information, please see the [audit device
+documentation](/docs/audit/index.html)
+
+## Examples
+
+Enable an audit device:
+
+```text
+$ vault audit enable file file_path=/tmp/my-file.txt
+Success! Enabled the file audit device at: file/
+```
+
+List all audit devices:
+
+```text
+$ vault audit list
+Path     Type    Description
+----     ----    -----------
+file/    file    n/a
+```
+
+Disable an audit device:
+
+```text
+$ vault audit disable file/
+Success! Disabled audit device (if it was enabled) at: file/
+```
+
+## Usage
+
+```text
+Usage: vault audit <subcommand> [options] [args]
+
+  # ...
+
+Subcommands:
+    disable    Disables an audit device
+    enable     Enables an audit device
+    list       Lists enabled audit devices
+```
+
+For more information, examples, and usage about a subcommand, click on the name
+of the subcommand in the sidebar.