Add notation points along realtime graph.

[jazzmonger]

trafficstars

Describe the solution you'd like I sit and watch this graph for hours while adjusting my Pellet Stove.....

all the while, I make small adjustments here and there.
It would be GREAT if I could click somewhere and add a notation so I know what change I made and when....

Scribble quick mockup!

Additional context Add any other context or screenshots about the feature request here.