This PR contains the work done to create the `Filter` library into the **Libraries** package, and moved the `FilterWordsUseCase` use case to it from the `Foundation` library. Reviewed-on: #7 Co-authored-by: Javier Cicchelli <javier@rock-n-code.com> Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>