Add client configuration notes

This covers the last of the content from the old mudpy Web site, a
stub page with an example configuration for 8-bit Telnet clients.

diff --git a/doc/source/clients.rst b/doc/source/clients.rst
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+++ b/doc/source/clients.rst
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+=========
+ clients
+=========
+
+.. Copyright (c) 2004-2018 Jeremy Stanley <fungi@yuggoth.org>.
+   Permission to use, copy, modify, and distribute this software is
+   granted under terms provided in the LICENSE file distributed with
+   this software.
+
+mudpy handles input, output and formatting of UTF-8 encoded,
+multi-byte and wide characters, when coupled with a supporting
+client. By default, however, only printable single-byte ASCII
+characters are accepted or displayed unless the client negotiates
+IETF RFC 856 *binary mode* first. If mudpy needs to send text
+containing extended characters to a non-binary (7-bit) client, it
+will first replace those characters with a question mark (``?``).
+
+For example, the following is the recommended ``.telnetrc`` file for
+interacting with mudpy in binary mode with the Netkit and Inetutils
+Telnet clients::
+
+  example.mudpy.org set binary
+  example.mudpy.org unset echo
+  example.mudpy.org unset escape
+  example.mudpy.org unset flushoutput
+  example.mudpy.org unset interrupt
+  example.mudpy.org unset quit
+  example.mudpy.org unset eof
+  example.mudpy.org unset localchars