added encoding function for tuple datatype

[muralidharan3194]

Encoding tuple using Poison:

• Converted the tuple to List using Tuple.to_list({1, 2.5,:atom , ‘string’}) operation then encoded the list using lists:foldr erlang function for iteration, which iterates in reverse order and each iterated value is encoded using respective encoding datatype function.

Input given:

output:

[azizk]

I'm curious how this is meaningful, because in JSON there is no tuple data type. Could you describe a concrete use case for this?

In any case, it's always possible to implement the Poison.Encoder protocol in your own projects. It doesn't seem warranted to include this in Poison itself, although a discussion could be had if tuples were to be encoded as lists by default.