Adds asio library and Storage Module

lib/asio-1.18.0/doc/asio/tutorial/tutdaytime5.html

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+<title>Daytime.5 - A synchronous UDP daytime server</title>
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+<div class="titlepage"><div><div><h3 class="title">
+<a name="asio.tutorial.tutdaytime5"></a><a class="link" href="tutdaytime5.html" title="Daytime.5 - A synchronous UDP daytime server">Daytime.5 - A synchronous
+      UDP daytime server</a>
+</h3></div></div></div>
+<p>
+        This tutorial program shows how to use asio to implement a server application
+        with UDP.
+      </p>
+<pre class="programlisting">int main()
+{
+  try
+  {
+    asio::io_context io_context;
+</pre>
+<p>
+        Create an <a class="link" href="../reference/ip__udp/socket.html" title="ip::udp::socket">ip::udp::socket</a>
+        object to receive requests on UDP port 13.
+      </p>
+<pre class="programlisting">    udp::socket socket(io_context, udp::endpoint(udp::v4(), 13));
+</pre>
+<p>
+        Wait for a client to initiate contact with us. The remote_endpoint object
+        will be populated by <a class="link" href="../reference/basic_datagram_socket/receive_from.html" title="basic_datagram_socket::receive_from">ip::udp::socket::receive_from()</a>.
+      </p>
+<pre class="programlisting">    for (;;)
+    {
+      boost::array&lt;char, 1&gt; recv_buf;
+      udp::endpoint remote_endpoint;
+      socket.receive_from(asio::buffer(recv_buf), remote_endpoint);
+</pre>
+<p>
+        Determine what we are going to send back to the client.
+      </p>
+<pre class="programlisting">      std::string message = make_daytime_string();
+</pre>
+<p>
+        Send the response to the remote_endpoint.
+      </p>
+<pre class="programlisting">      asio::error_code ignored_error;
+      socket.send_to(asio::buffer(message),
+          remote_endpoint, 0, ignored_error);
+    }
+  }
+</pre>
+<p>
+        Finally, handle any exceptions.
+      </p>
+<pre class="programlisting">  catch (std::exception&amp; e)
+  {
+    std::cerr &lt;&lt; e.what() &lt;&lt; std::endl;
+  }
+
+  return 0;
+}
+</pre>
+<p>
+        See the <a class="link" href="tutdaytime5/src.html" title="Source listing for Daytime.5">full source listing</a>
+      </p>
+<p>
+        Return to the <a class="link" href="../tutorial.html" title="Tutorial">tutorial index</a>
+      </p>
+<p>
+        Previous: <a class="link" href="tutdaytime4.html" title="Daytime.4 - A synchronous UDP daytime client">Daytime.4 - A synchronous
+        UDP daytime client</a>
+      </p>
+<p>
+        Next: <a class="link" href="tutdaytime6.html" title="Daytime.6 - An asynchronous UDP daytime server">Daytime.6 - An asynchronous
+        UDP daytime server</a>
+      </p>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
+<td align="left"></td>
+<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
+      Kohlhoff<p>
+        Distributed under the Boost Software License, Version 1.0. (See accompanying
+        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
+      </p>
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