Add statistics

Update README
Update TODO

src/view/StatsPanel.h

@@ -61,11 +61,16 @@ class StatsPanel: public wxPanel //public wxScrolledWindow
   XYPlot *_plot ;
   wxString* _categories;  
   std::map<wxString, int> _categoriesIndexes;
+  wxBoxSizer *_hbox2, *_vbox2;
+  wxChartPanel* _chart;
+  wxCheckListBox* _account;
 
-  void UpdateStats(wxBoxSizer *);
+  void UpdateStats(int monthFrom, int yearFrom, int monthTo, int yearTo);
 
-  //DECLARE_EVENT_TABLE();
+  void OnRangeChange(wxCommandEvent& event);
+  void OnAccountsChange(wxCommandEvent& event);
 
+  DECLARE_EVENT_TABLE();
 };
 
 #endif