Add a magic 8 ball function

[peter1357908]

From Nancy:

I think it would be better if there is a new function to predict my today’s fortune. There are two way to implement it:

Option 1:

Like fortune cookies 🥠, it may display random things, such as “10 Doras are on the way,” “Every good and perfect
gift is from riichi, ” or “Don't let yesterday
take up too much of today’ hand.”

Option 2:
A random number (0-100) function and call it “fortune index” to predict whether the person should play mahjong today. Ex: if they roll 100, “it’s a lucky day to play mahjong, you may win something big!” If they roll 20, “there is always something important than mahjong🀄️”