Creation of a diff of a new port

[Kralj Karlo]

I am trying to create a diff of a new port in order that I may submit the port.
I believe to have followed the directions from the Porter's Handbook, but
the result is not as I had expected.

  $ portsnap fetch
       (I didn't save the output.)
  $ portsnap extract
       (I didn't save the output.)
  $ svn checkout https://svn.FreeBSD.org/ports/head /usr/ports
   ... (lots of output omitted)
     A /usr/ports/Keywords/shell.ucl
     A /usr/ports/Keywords/fc.ucl
     A /usr/ports/Keywords/desktop-file-utils.ucl
   U   /usr/ports
  Checked out revision 508034.
  $ cp -r my-keynav-port /usr/ports/x11/keynav
  $ svn add /usr/ports/x11/keynav/
  svn: E155013: Can't add '/usr/ports/x11/keynav' to a parent directory scheduled for deletion
  $ uname -a
  FreeBSD t5600 12.0-RELEASE FreeBSD 12.0-RELEASE r341666 GENERIC  amd64

Also, I have tried running "svn diff" on ports that I did not change.
I expected no output in such cases and was surprised to see output.

  $ svn diff | head
  Index: Makefile
  ===================================================================
  --- Makefile    (revision 508034)
  +++ Makefile    (nonexistent)
  @@ -1,102 +0,0 @@
  -# Created by: Scott Blachowicz <scott+ports at sabami.seaslug.org>
  -# $FreeBSD$
  -
  -PORTNAME=      nmh
  -PORTVERSION=   1.7.1

What must I do in order add the new directory?

I pray that you have faith in my best sentiments.
Kralj Karlo