Add tailwind widget description to README

README.md

@@ -34,6 +34,7 @@ If you are using a Karoo 2, you can use manual sideloading:
 After installing this app on your Karoo and opening it once from the main menu, you can add the following new data fields to your data pages:
 
 - Headwind (graphical, 1x1 field): Shows the headwind direction and speed as a circle with a triangular direction indicator. The speed is shown at the center in your set unit of measurement (default is kilometers per hour if you have set up metric units in your Karoo, otherwise miles per hour). Both direction and speed are relative to the current riding direction by default, i. e., riding directly into a wind of 20 km/h will show a headwind speed of 20 km/h, while riding in the same direction will show -20 km/h. You can change this behavior in the app settings to show the absolute wind direction and speed instead.
+- Tailwind with riding speed (graphical, 1x1 field): Shows an arrow indicating the current headwind direction next to a label reading your current speed and the speed of the tailwind. If you ride against a headwind of 5 mph, it will show "-5". If you ride in the same direction of a 5 mph wind, it will read "+5". Text and arrow are colored based on the tailwind speed, with red indicating a strong headwind and green indicating a strong tailwind.
 - Weather forecast (graphical, 2x1 field): Shows three columns indicating the current weather conditions (sunny, cloudy, ...), wind direction, precipitation and temperature forecasted for the next three hours. Tap on this widget to cycle through the 12 hour forecast.
 - Additionally, data fields that only show the current data value for headwind speed, humidity, cloud cover, absolute wind speed, absolute wind gust speed, absolute wind direction, rainfall and surface pressure can be added if desired.