Leveling Up - First cabal benchmark

[JonathanLorimer]

file to edit: https://github.com/haskell/cabal-userguide/blob/main/src/leveling_up/03_first_cabal_benchmark.md

Brief Summary

The motivation for this section is to show new users how to benchmark the performance of their applications using cabal.

Resources

Old cabal user guide bench-marking reference