Pushing example to manage downloaded offline regions

[ZiZasaurus]

Created an example for parity between iOS and Android regarding managing offline regions

[ZiZasaurus]

Worked with @captainbarbosa to add extension for progressPercentage calculation -- i added an if statement in the extension because it wouldn't run properly otherwise.

Also addressed the following issues:

• why cells were duplicating
• cleaned up formatting and removed unnecessary print statements (left the ones from the original example)
• fixed cell subtitle issue

[captainbarbosa]

@ZiZasaurus please re-request review when ready (the little 🔁 symbol next to my name in the reviewers list)

[ZiZasaurus]

Git made me do a merge so let me know if anything looks off

[captainbarbosa]