Create example-frozen-columns-and-cell-grouping.html

[Hunt05]

• ref When grid grouping and freezing columns are used together, the display is not normal #443

[ghiscoding]

@Hunt05
Thanks for the new Example, however I don't see this as fixing the issue #443 unless I misunderstood something. If I change the grid option to frozenColumn: 0, the problem is exactly the same as what described in the issue #443
see print screen