Adds asio library and Storage Module

lib/asio-1.18.0/doc/asio/reference/buffers_iterator/reference.html

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+<p>
+          <a class="indexterm" name="asio.indexterm.buffers_iterator.reference"></a> 
+The type
+          of the result of applying <code class="computeroutput">operator*()</code> to the iterator.
+        </p>
+<pre class="programlisting">typedef const_or_non_const_ByteType &amp; reference;
+</pre>
+<p>
+          If the buffer sequence stores buffer objects that are convertible to <a class="link" href="../mutable_buffer.html" title="mutable_buffer"><code class="computeroutput">mutable_buffer</code></a>,
+          this is a reference to a non-const ByteType. Otherwise, a reference to
+          a const ByteType.
+        </p>
+<h6>
+<a name="asio.reference.buffers_iterator.reference.h0"></a>
+          <span><a name="asio.reference.buffers_iterator.reference.requirements"></a></span><a class="link" href="reference.html#asio.reference.buffers_iterator.reference.requirements">Requirements</a>
+        </h6>
+<p>
+          <span class="emphasis"><em>Header: </em></span><code class="literal">asio/buffers_iterator.hpp</code>
+        </p>
+<p>
+          <span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
+        </p>
+</div>
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+<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>)
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