Adds asio library and Storage Module

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

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+<p>
+        <a class="indexterm" name="asio.indexterm.buffer_size"></a> 
+Get the total number of bytes in a buffer
+        sequence.
+      </p>
+<pre class="programlisting">template&lt;
+    typename BufferSequence&gt;
+std::size_t buffer_size(
+    const BufferSequence &amp; b);
+</pre>
+<p>
+        The <code class="computeroutput">buffer_size</code> function determines the total size of all buffers
+        in the buffer sequence, as if computed as follows:
+      </p>
+<pre class="programlisting">size_t total_size = 0;
+auto i = asio::buffer_sequence_begin(buffers);
+auto end = asio::buffer_sequence_end(buffers);
+for (; i != end; ++i)
+{
+  const_buffer b(*i);
+  total_size += b.size();
+}
+return total_size;
+</pre>
+<p>
+        The <code class="computeroutput">BufferSequence</code> template parameter may meet either of the
+        <code class="computeroutput">ConstBufferSequence</code> or <code class="computeroutput">MutableBufferSequence</code> type
+        requirements.
+      </p>
+<h5>
+<a name="asio.reference.buffer_size.h0"></a>
+        <span><a name="asio.reference.buffer_size.requirements"></a></span><a class="link" href="buffer_size.html#asio.reference.buffer_size.requirements">Requirements</a>
+      </h5>
+<p>
+        <span class="emphasis"><em>Header: </em></span><code class="literal">asio/buffer.hpp</code>
+      </p>
+<p>
+        <span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
+      </p>
+</div>
+<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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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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