Add documentation for HTTP client API.

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diff --git a/docs/nng_http_client_alloc.adoc b/docs/nng_http_client_alloc.adoc
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+= nng_http_client_alloc(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_http_client_alloc - allocate HTTP client
+
+== SYNOPSIS
+
+[source, c]
+-----------
+#include <nng/nng.h>
+
+int nng_http_client_alloc(nng_http_client *clientp, const nng_url *url);
+-----------
+
+
+== DESCRIPTION
+
+The `nng_http_client_alloc()` allocates an HTTP client suitable for
+connecting to the server identifyed by _url_ and stores a pointer to
+it in the location referenced by _clientp_.
+
+== RETURN VALUES
+
+This function returns 0 on success, and non-zero otherwise.
+
+== ERRORS
+
+`NNG_ENOMEM`:: Insufficient free memory exists.
+`NNG_ENOTSUP`:: HTTP not supported.
+
+== SEE ALSO
+
+<<nng_http_client_connect#,nng_http_client_connect(3)>>,
+<<nng_http_client_free#,nng_http_client_free(3)>>,
+<<nng_url_parse#,nng_url_parse(3)>>
+<<nng_strerror#,nng_strerror(3)>>,
+<<nng#,nng(7)>>
+
+== COPYRIGHT
+
+{copyright}