Adds asio library and Storage Module

lib/asio-1.18.0/doc/asio/reference/thread/join.html

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+<p>
+          <a class="indexterm" name="asio.indexterm.thread.join"></a> 
+Wait for the thread to exit.
+        </p>
+<pre class="programlisting">void join();
+</pre>
+<p>
+          This function will block until the thread has exited.
+        </p>
+<p>
+          If this function is not called before the thread object is destroyed, the
+          thread itself will continue to run until completion. You will, however,
+          no longer have the ability to wait for it to exit.
+        </p>
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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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