Add dialer documentation.

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diff --git a/docs/nng_dialer_create.adoc b/docs/nng_dialer_create.adoc
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+= nng_dialer_create(3)
+:doctype: manpage
+:manmanual: nng
+:mansource: nng
+:manvolnum: 3
+:copyright: Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] + \
+            Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV] + \
+            {blank} + \
+            This document is supplied under the terms of the \
+            https://opensource.org/licenses/MIT[MIT License].
+
+== NAME
+
+nng_dialer_create - create dialer
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+
+int nng_dialer_create(nng_dialer *dialerp, nng_socket s, const char *url);
+-----------
+
+== DESCRIPTION
+
+The `nng_dialer_create()` function creates a newly initialized
+dialer, associated with socket _s_, and configured to connect to the
+address specified by _url_, and stores a pointer to at the location
+referenced by _dialerp_.
+
+Dialers initiate a remote connection to a listener. Upon a successful
+connection being established, they create a pipe, add it to the socket,
+and then wait for that pipe to be closed.  When the pipe is closed,
+they will re-initiate the connection.  Dialer's will also periodically
+retry a connection automatically if an attempt to connect asynchronously
+fails.
+
+TIP: While it is convenient to think of dialers as "clients", the relationship
+between the listener or dialer is orthogonal to any server or client status
+that might be associated with a given protocol.  For example, a <<nng_req#,REQ>>
+socket might have associated dialers, but might also have associated listeners.
+It may even have some of each at the same time!
+
+The dialer is not started, but may be further configured with
+the <<nng_dialer_setopt#,nng_dialer_setopt(3)>> family of
+functions.
+
+Once it is fully configured, the dialer may be started using the
+<<nng_dialer_start#,nng_dialer_start(3)>> function.
+
+TIP: If no specific configuration is required, consider using the
+simpler <<nng_dial#,nng_dial(3)>> function instead.
+
+== RETURN VALUES
+
+This function returns 0 on success, and non-zero otherwise.
+
+== ERRORS
+
+`NNG_EADDRINVAL`:: An invalid _url_ was specified.
+`NNG_ECLOSED`:: The socket _s_ is not open.
+`NNG_ENOMEM`:: Insufficient memory is available.
+
+== SEE ALSO
+
+<<nng_dial#,nng_dial(3)>>,
+<<nng_dialer_close#,nng_dialer_close(3)>>,
+<<nng_dialer_getopt#,nng_dialer_getopt(3)>>,
+<<nng_dialer_setopt#,nng_dialer_setopt(3)>>,
+<<nng_dialer_start#,nng_dialer_start(3)>>,
+<<nng_listener_create#,nng_listener_create(3)>>
+<<nng_strerror#,nng_strerror(3)>>,
+<<nng#,nng(7)>>
+
+== COPYRIGHT
+
+{copyright}