Implement RealmDB for the data persistence layer

[shayneptorres]

Currently the app is persisting data using UserDefaults. While not an incorrect usage, it would be better to use a dedicated DB framework to manage modeling, saving, and querying data. After discussion in this issue we have decided to move forward with using RealmDB as our dedicated data persistence layer.

This issue will track the implementation of RealmSwift in the iOS application

[shayneptorres]

I want to apologize for the lack of updates in the last couple weeks. With everything going on I got distracted with some personal stuff. I am still planning on finishing this work and pushing the commits. If you have any questions please reach out. Also I hope you all are staying healthy

[eddielement]

Same to you @shayneptorres !