More datatypes for example records

[amilan17]

The idea is to focus on having example metadata records for types of data that are already being exchanged on WIS2 and we should coordinate with the data providers. 

for starters, this is a list of unique topics that I'm seeing today on MQTT explorer

• origin/a/wis2/usa/synoptic_data_pbc/data/core/weather/surface-based-observations/synop
• origin/a/wis2/ury/uruguay_inumet/data/core/weather/surface-based-observations/synop
• origin/a/wis2/hkg/hongkong/data/core/weather/surface-based-observations/profiler
• origin/a/wis2/sgp/mss/data/core/weather/surface-based-observations/ship
• origin/a/wis2/deu/dwd/data/core/weather/surface-based-observations/webcams
• origin/a/wis2/hkg/hongkong/data/core/weather/surface-based-observations/profiler
• origin/a/wis2/sgp/mss/data/core/weather/surface-based-observations/wind_profiler
• origin/a/wis2/sgp/asmc/data/recommended/weather/space-based-observations/jp1_afedr_750m_nrt
• origin/a/wis2/sgp/asmc/data/recommended/weather/space-based observations/jp1_afedr_750m_late
• origin/a/wis2/xxf/eumetsat/data/core/weather/space-based-observations/satellite4nowcasting/Meteosat-10/ImageL1-5
• cache/a/wis2/ita/meteoam/data/core/weather/surface-based-observations/temp
• cache/a/wis2/usa/cimss/data/core/weather/space-based-observations/satellite4nwp/NOAA-20/CrISL1
• cache/a/wis2/usa/cimss/data/core/weather/space-based-observations/satellite4nwp/METOP-B/IASIL1
• cache/a/wis2/sgp/mss/data/core/weather/surface-based-observations/amdar
• origin/a/wis2/xxg/swic/data/core/weather/advisories-warnings/usa
• origin/a/wis2/xxg/swic/data/core/weather/advisories-warnings/deu
• origin/a/wis2/xxg/swic/data/core/weather/advisories-warnings/irl