add met eireann app

[vincentezw]

👋 This PR adds my "Met Eireann" app. Met Eireann is Ireland's national meteorological service, and this app uses their publicly available "Forecast API". The app rotates between current conditions, hourly forecast for the next 6 hours, and daily forecast for the next 6 days. For each, it shows an icon for the condition, wind direction and speed, and expected precipitation.

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