Create item on mesh via mouse cursor position

[likage]

I am trying to do something as follows:

• Within the viewport
  
• Mouse cursor hover onto a pPlane for example (at any position)
  
• Prior to the mouse cursor/ position, as user clicks on their mouse, it will create a locator right at the mouse cursor position that user has specified

Optional : But I plan to include using modifier keys too, but for now I am trying to get the first 3 points working

To be honest, I have got no idea where to start. Could someone kindly enlighten me on this?

I tried searching online where some uses Maya API or cmds.draggerContext (Tried using the example in the docs but it is failing on me), and as I do not quite understand API, I was hoping if anyone can kindly guide me on what I should try proceeding