Add "auth list" command documentation

website/source/docs/commands/auth/list.html.md

@@ -0,0 +1,43 @@
+---
+layout: "docs"
+page_title: "auth list - Command"
+sidebar_current: "docs-commands-auth-list"
+description: |-
+  The "auth list" command lists the auth methods enabled. The output lists the
+  enabled auth methods and options for those methods.
+---
+
+# auth list
+
+The `auth list` command lists the auth methods enabled. The output lists the
+enabled auth methods and options for those methods.
+
+## Examples
+
+List all auth methods:
+
+```text
+$ vault auth list
+Path         Type        Description
+----         ----        -----------
+token/       token       token based credentials
+userpass/    userpass    n/a
+```
+
+List detailed auth method information:
+
+```text
+$ vault auth list -detailed
+Path         Type        Accessor                  Plugin    Default TTL    Max TTL    Replication    Description
+----         ----        --------                  ------    -----------    -------    -----------    -----------
+token/       token       auth_token_b2166f9e       n/a       system         system     replicated     token based credentials
+userpass/    userpass    auth_userpass_eea6507e    n/a       system         system     replicated     n/a
+```
+
+## Usage
+
+The following flags are available in addition to the [standard set of
+flags](/docs/commands/index.html) included on all commands.
+
+- `-detailed` `(bool: false)` - Print detailed information such as configuration
+  and replication status about each auth method.