add readme file

README.rst

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+Bitcoin-qt: Qt4 based GUI replacement for Bitcoin
+=================================================
+
+**Warning** **Warning** **Warning**
+Pre-alpha stuff! Developer only!
+
+This has been implemented:
+
+- qmake / QtCreator project (.pro)
+
+- All dialogs (main GUI, address book, send coins) and menus
+
+- Taskbar icon/menu
+
+- GUI only functionality (copy to clipboard, select address, address/transaction filter proxys)
+
+- Bitcoin core is made compatible with Qt4, and linked against
+
+- Send coins dialog: address and input validation
+
+- Address book and transactions views
+
+This has to be done:
+
+- Further integration of bitcoin core, so that it can actually connect
+  to the network, send commands and get feedback
+
+- Address book and transactions models: so that 
+  something sensible is shown instead of dummy data :)
+
+- Internationalization (convert WX language files)
+
+- Build on Windows