kronometer: adding homepage and description

pkgs/tools/misc/kronometer/default.nix

@@ -17,6 +17,8 @@ mkDerivation rec {
   };
 
   meta = with lib; {
+    homepage = "https://kde.org/applications/utilities/kronometer/";
+    description = "A stopwatch application";
     license = licenses.gpl2;
     maintainers = with maintainers; [ peterhoeg ];
   };