API limit

[santiaguf]

as mentioned in #25, the API has a limit of 15 calls per hour. After that the API returns this: { "detail": "Request was throttled. Expected available in X seconds." } where X is the number of seconds before 1 hour. the HTTP code is 429.

Todo:

• handle this result to show that information in the App so the users can wait.
• research about caching using LocalStorage.

[santiaguf]

I just created this diagram for caching strategy.