add in possibilities for icon_descriptor values

[Luen]

The icon_descriptor is a string value that succinctly summarises the overall weather condition expected for the given time period, such as 'sunny', 'cloudy', 'rain', etc.

The pull request adds in the possible values returned, which include:

'clear': Clear sky, typically indicating no clouds.
'sunny': Bright and sunny conditions.
'mostly_sunny': Predominantly sunny with some clouds.
'partly_cloudy': A mix of sun and clouds.
'cloudy': Overcast or cloudy skies.
'rain': Rainy conditions.
'shower': Intermittent or light rain showers.
'light_rain': Light rainfall.
'heavy_shower': Heavy rain showers.
'storm': Stormy conditions, possibly with thunder.
'cyclone': Cyclonic conditions or hurricanes.
'windy': Strong winds.
'hazy': Haze conditions, typically indicating reduced visibility.
'fog': Foggy conditions, indicating very low visibility.
'dusty': Dusty weather conditions.
'frost': Frosty conditions, often with ice formation.
'snow': Snowy conditions.

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Name	Status	Preview	Comments	Updated (UTC)
bom-weather-docs	❌ Failed (Inspect)			Mar 19, 2025 0:47am

[tsnoad]

Not sure if this repo is still active, and if this will be merged, but I wanted to say this was super helpful to me - thanks @Luen !