add README

README

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+%% This is htikz package.
+%%
+%% A simple way to highlight formulas parts.
+%%
+%% Copyright (C) 2012 by Claudio Fiandrino
+%%
+%% claudio dot fiandrino at gmail dot com
+%% -------------------------------------------
+%% 
+%% This file may be distributed and/or modified under the
+%% conditions of the LaTeX Project Public License, either version 1.3
+%% of this license or (at
+%%  your option) any later version.
+%% The latest version of this license is in:
+%% 
+%%    http://www.latex-project.org/lppl.txt
+%% 
+%% and version 1.3 or later is part of all distributions of LaTeX
+%% version 2005/12/01 or later.
+%% 
+%% This work is "maintained" (as per LPPL maintenance status) by
+%% Claudio Fiandrino.
+%% 
+%% This work consists of the file  htikz.dtx
+%% and the derived files           htikz.pdf and
+%%                                 htikz.sty.