Add NSW Combined Drought Indicator under Agriculture

[AnaBelgun]

Add the NSW Combined Drought indicator under the Agriculture group. Create a new subgroup, named Drought. https://map.drought.gov.au/#share=s-lHhySElxvtB7IlAnssdwNyfenOh The API url is: https://edis.carto.com/api/v1/map/named/DAILY_CDI2