add summary table

[soerenthomsen]

Anne raised this point related to sensors specifications and glider integrations

"A summary table could be useful to list the characteristics of the nitrate sensors used on the gliders (name, manufacturer, space requirement, weight, power consumption, concentration range, lamp, measurement frequency, max. pressure, anti-fouling options, communication bandwidth, compatibility with which type of glider, bibliographic references, etc..)"

[gkrahmann]

would we want this in the introduction (like Ox SOP) or in the sensors section ?