Check in hsimport.hs and create hacking subdir

hacking/HACKING.md

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+HACKING
+=======
+
+Coding style
+------------
+
+- match the sorroundings
+- no overcomplicated pointfree style
+- normal indenting 2 whitespaces
+- just make things pretty and readable
+
+Documentation
+-------------
+
+__Everything__ must be documented. :)
+
+Hacking Guide
+-------------
+
+The main data structure is in [DirTree.hs](src/Data/DirTree.hs), which
+should be seen as a library. This is then mapped into the Gtk+ GUI at
+[Gtk.hs](src/GUI/Gtk.hs) and [Utils.hs](src/GUI/Gtk/Utils.hs).
+
+File operations (like copy, delete etc) are defined at
+[File.hs](src/IO/File.hs).
+
+Note that the main data structures are still a bit in flux. Join
+[the discussion](https://github.com/hasufell/hsfm/issues/12) on how to
+improve them.