Update and rename HACKING to HACKING.md

HACKING.md

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+
+### Coding Style: ###
+
+If you want to send a patch please follow the Qt/KDE coding style:
+
+    http://developer.qt.nokia.com/wiki/Qt_Coding_Style
+    http://techbase.kde.org/Policies/Kdelibs_Coding_Style
+
+Remember that you can use astyle to indent the code automatically:
+
+```
+astyle --style=k/r --indent=spaces=4 --convert-tabs \
+       --pad-header --unpad-paren \
+       --indent-namespaces --keep-one-line-blocks --align-pointer=name \
+       --max-instatement-indent=8 --indent-col1-comments \
+       --suffix=none \
+       `find -type f -name '*.cpp'` `find -type f -name '*.h'`
+```
+
+### Understanding the Code: ###
+
+All the code is documented with Doxygen. If want to see this documentation in html format, go to the ./documentation folder and run:
+
+```
+$ doxygen doxyfile
+```
+
+The ./documentation/html/index.html file is a good place to begin.
+
+Touchégg makes an intensive use of Qt and uTouch. Reading this can help:
+
+    http://doc.qt.io/
+    http://people.canonical.com/~stephenwebb/geis-v2-api/
+
+
+### Contact the developer: ###
+
+If you want to report a bug, you can do it in the official bug tracker:
+
+    https://github.com/JoseExposito/touchegg/issues
+
+For other questions, talk about the weather or invite me to a beer :beer: you can send me an email to jose.exposito89@gmail.com
+
+Happy coding!