Add GitHub tags to repositories

[s-celles]

Hello,

GitHub tags are missing for the following repositories

• https://github.com/JuliaCollections/FunctionalCollections.jl
• https://github.com/JuliaCollections/SortingAlgorithms.jl
• https://github.com/JuliaCollections/DataStructures.jl

It will help to have some

Kind regards