Added the docs

website/source/docs/commands/fs.html.md.erb

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+---
+layout: "docs"
+page_title: "Commands: fs"
+sidebar_current: "docs-commands-fs"
+description: >
+  Introspect an allocation directory on a Nomad client
+---
+
+# Command: fs
+
+The `fs` family of commands allows a user to navigate an allocation directory on a Nomad
+client. The following subcommands are available - `cat`, `ls` and `stat`
+
+## Usage 
+
+```
+nomad fs ls <alloc-id> <path>
+nomad fs stat <alloc-id> <path>
+nomad fs cat <alloc-id> <path>
+```
+
+A valid allocation id is necessary and the path is relative to the root of the allocation directory.
+The path is optional and it defaults to `/` of the allocation directory
+
+## Examples
+
+$ nomad fs ls eb17e557
+Mode        Size  Modfied Time         Name
+drwxrwxr-x  4096  28 Jan 16 05:39 UTC  alloc/
+drwxrwxr-x  4096  28 Jan 16 05:39 UTC  redis/
+-rw-rw-r--  0     28 Jan 16 05:39 UTC  redis_exit_status
+
+
+$ nomad fs ls redis/local
+Mode        Size  Modfied Time         Name
+-rw-rw-rw-  0     28 Jan 16 05:39 UTC  redis.stderr
+-rw-rw-rw-  17    28 Jan 16 05:39 UTC  redis.stdout
+
+
+$ nomad fs stat redis/local/redis.stdout
+Mode        Size  Modified Time        Name
+-rw-rw-rw-  17    28 Jan 16 05:39 UTC  redis.stdout
+
+
+$ nomad fs cat redis/local/redis.stdout 
+6710:C 27 Jan 22:04:03.794 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
+6710:M 27 Jan 22:04:03.795 * Increased maximum number of open files to 10032 (it was originally set to 256).
+