Updated README.md

Now it includes the known issue of Tashkeel.

Author: mpcabd

README.md

@@ -1,20 +1,23 @@
-#    Python Arabic Reshaper
+##    Python Arabic Reshaper
 Reconstruct Arabic sentences to be used in applications that don't support Arabic
 
 Based on [Better Arabic Reshaper](https://github.com/agawish/Better-Arabic-Reshaper/), ported to Python, tweaked a little bit.
 
 For more info visit my blog [post here](http://mpcabd.igeex.biz/python-arabic-text-reshaper/)
 
-#    License
+## Known Issue
+[Harakat or Tashkeel](http://en.wikipedia.org/wiki/Arabic_diacritics#Tashkil_.28marks_used_as_phonetic_guides.29) are not supported, and I think that they can't be supported as their unicode characters are non-spacing marks (i.e. they don't take space, they are rendered in the same space of the character before them), which means that when used in a reshaper, they will be rendered on the next character as the text is reversed.
+
+##    License
 This work is licensed under [GNU General Public License v3](http://www.gnu.org/licenses/gpl.txt).
 
-#    Demo
+##    Demo
 *    Online Arabic Reshaper: http://pydj.igeex.biz/arabic-reshaper/
 
-#    Download
+##    Download
 *    Source Code:  	https://github.com/mpcabd/python-arabic-reshaper/tarball/master
 
-#    Contact
+##    Contact
 *    Abd Allah Diab (mpcabd)
 *    Email: 	mpcabd {AT} G Mail (dot) COM
 *    Blog:	http://mpcabd.igeex.biz