Implement a working Settings activity

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Description

Add a settings/preference system to the app. For now, it should be able to set the FaceAccess server hostname/IP and the port as per user preference.

Resources

These resources should provide you with a good starting point to begin with.

1. https://codelabs.developers.google.com/codelabs/android-training-adding-settings-to-app/index.html?index=..%2F..android-training#0
2. https://blog.mindorks.com/implementing-preferences-settings-screen-in-android

Other Advisories

Fork the project and create another branch from the development to work on this feature.