Added a lesson with =RAND() -- how to create random numbers, more to come!

Just added a lesson with the formula =RAND(), which is used for creating random numbers.

This one is both relatively easy and, if used creatively, quite powerful.

From now on there will be more frequent updates on this site, still focusing on Calc. There is another lesson ready to be published early next week. And there are a lot more in the pipeline already!

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