add urls for tocgrib2 models

src/tocgrib2/docs/user_guide.md

@@ -16,8 +16,24 @@ field (extract=.true.). Both options return the same message if the
 requested field is the only field in the GRIB2 message.
 
 This program is used by a number of operational applications, 
-including ECMWF, ETSS, GEFS, GFS, GLMP, GLWU, HiResW, HREF, HRRR, LMP,
-NWPS, RAP, RTMA/URMA, RTOFS, seaice_analysis, SREF, and WSP.
+including:
+ - ECMWF
+ - [Extra-Tropical Storm Surge (ETSS)](https://slosh.nws.noaa.gov/etsurge/)
+ - [Global Ensemble Forecast System (GEFS)](https://www.ncei.noaa.gov/products/weather-climate-models/global-ensemble-forecast)
+ - [Global Forecast System (GFS)](https://www.ncei.noaa.gov/products/weather-climate-models/global-forecast)
+ - [Gridded LAMP (GLMP)](https://vlab.noaa.gov/web/mdl/gridded-lamp)
+ - [Great Lakes Wave model (GLWU)](https://polar.ncep.noaa.gov/waves/index.php)
+ - [High-Resolution Window Forecast System (HiResW)](https://www.nco.ncep.noaa.gov/pmb/products/hiresw/)
+ - [High Resolution Ensemble Forecast (HREF)](https://mag.ncep.noaa.gov/model-guidance-model-parameter.php?group=Model%20Guidance&model=HREF&area=CONUS&ps=area)
+ - [High-Resolution Rapid Refresh (HRRR)](https://rapidrefresh.noaa.gov/hrrr/)
+ - [Localized Aviation MOS Program (LMP)](https://vlab.noaa.gov/web/mdl/lamp)
+ - [Nearshore Wave Prediction System (NWPS)](https://polar.ncep.noaa.gov/nwps/)
+ - [Rapid Refresh (RAP)](https://rapidrefresh.noaa.gov/)
+ - [Real-Time & Unrestricted Mesoscale Analysis (RTMA/URMA)](https://www.nco.ncep.noaa.gov/pmb/products/rtma/)
+ - [Real-Time Ocean Forecast System (RTOFS)](https://polar.ncep.noaa.gov/global/)
+ - seaice_analysis
+ - [Short-Range Ensemble Forecast (SREF)](https://www.nco.ncep.noaa.gov/pmb/products/sref/)
+ - [Wind Speed Probabilities (WSP)](https://www.nhc.noaa.gov/gis/)
 
 ### Input Files
 - 5 namelist of grib fields and associated wmo headers.