my_leafletproxy: Add polylines to an existing map
In Davide-bll/Shinymod: Help building Shiny modules

Add polylines to an existing map

1	my_leafletproxy(data, grp_f, clr = "blue", proxy, label, criteria, traj_col)

`data`	Data containing lynes, and lng, lat cols
`grp_f`	Levels of the group accepted. The group is identified by `criteria`
`clr`	chr. Identy the colors of the lines
`proxy`	Existing Leaflet map.
`label`	Chr. Label pf the line
`criteria`	Chr. Name of the column identifying the filter group.
`traj_col`	Chr. Name of the column identifying the Trajectories