This directory contains all the Physics Vectors  classes.
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 Several documents describing these classes are listed below:
<ul>
<li>The main histogram class is documented in class TGeoManager.</li>
<li><a href="ftp://root.cern.ch/root/doc/chapter18.pdf">The Chapter about the Physics Vectors classes in the Users Guide
    </a></li>
</ul>
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Add doc directory files for "physics"
Add doc directory files for "physics"


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@17882 27541ba8-7e3a-0410-8455-c3a389f83636
