add content-genration scenario sample

[YijunMS]

The new sample is part of the scenario experiment for Word JS developers. I changed the order of existing scenario samples to make the new sample more conspicuous. It would be good if we can move the whole "scenarios" folder to an earlier position, but I am not sure if it is safe to do that.

[xiruatms]

@AlexJerabek , will you please help to review when available? Thanks.