The purpose of Cartographer_Quicknotes is to add more slash commands for inserting notes into Cartographer. I created the addon for my own use because I wanted more functionality than "/note" command provides.
Specifically, I didn't like how a random icon was assigned when I used the "/note" command and I didn't like that I couldn't just "/note" and it would mark my current position.
What this addon does is add 4 new slash commands:
/ynote or /yellownote = note w/ yellow star (yellow square for Metamap Icons)
/rnote or /rednote = note w/ red cross (red square for Metamap Icons)
/pnote or /purplenote = note w/ purple diamond (purple square for Metamap Icons)
/gnote or /greennote = note w/ green triangle (green square for Metamap Icons)
I highly recommend downloading Cartographer_Icons and Cartographer_Icons_Metamap for use with this addon as I personally prefer the Metamap icons over the raid icons. However, both are supported.
/ynote <x>,<y> <title> = marks a yellow note at x,y with title
/ynote <title> = marks a yellow note at your location with title
/ynote = marks a yellow note at your location (title = target if exists & not player)