adding message option to the import subcommand

Signed-off-by: Taylor Jones <monitorjbl@gmail.com>

docs/reference/commandline/import.md

@@ -18,6 +18,7 @@ weight=1
 	optionally tag it.
 
       -c, --change=[]     Apply specified Dockerfile instructions while importing the image
+      -m, --message=      Set commit message for imported image
 
 You can specify a `URL` or `-` (dash) to take data directly from `STDIN`. The
 `URL` can point to an archive (.tar, .tar.gz, .tgz, .bzip, .tar.xz, or .txz)
@@ -46,6 +47,10 @@ Import to docker via pipe and `STDIN`.
 
     $ cat exampleimage.tgz | docker import - exampleimagelocal:new
 
+Import with a commit message 
+
+    $ cat exampleimage.tgz | docker import --message "New image imported from tarball" - exampleimagelocal:new
+
 Import to docker from a local archive.
 
     $ docker import /path/to/exampleimage.tgz