Documentation and Move the code into it's own sub-folder for Arduino

[drf5n]

It would be nice to have the code be in it's own fumik_rv9 subfolder like: fumik_rv9/fumik_rv9.ino so Arduino doesn't complain and move it.

It would also be nice to see a diagram identifying the triangles, angles and constants in

source-code/fumik_rv9.ino

Line 315 in cf6d6d7

void find_a_c(float x, float y){

As is, it looks very difficult to calibrate to a new installation. Is

source-code/fumik_rv9.ino

Line 324 in cf6d6d7

p = 3190;

the distance between the anchors?

Cool project, thanks.