add toggle for vim mode in options

DisplayOptionsPanel.c

@@ -100,6 +100,7 @@ DisplayOptionsPanel* DisplayOptionsPanel_new(Settings* settings, ScreenManager*
    Panel_add(super, (Object*) CheckItem_newByRef(xStrdup("Also show CPU percentage numerically"), &(settings->showCPUUsage)));
    Panel_add(super, (Object*) CheckItem_newByRef(xStrdup("Also show CPU frequency"), &(settings->showCPUFrequency)));
    Panel_add(super, (Object*) CheckItem_newByRef(xStrdup("Enable the mouse"), &(settings->enableMouse)));
+   Panel_add(super, (Object*) CheckItem_newByRef(xStrdup("Enable vim mode"), &(settings->vimMode)));
    #ifdef HAVE_LIBHWLOC
    Panel_add(super, (Object*) CheckItem_newByRef(xStrdup("Show topology when selecting affinity by default"), &(settings->topologyAffinity)));
    #endif