[wip] Coordinate transform example

[vpuri3]

To do:

1. fix latex rendering
2. add image

[KirillZubov]

very cool example

[vpuri3]

Thanks. Could you help me with the writeup? LaTeX isn't compiling in the markdown, and I don't know where to upload an image of the solution.

[KirillZubov]

Thanks. Could you help me with the writeup? LaTeX isn't compiling in the markdown, and I don't know where to upload an image of the solution.

documenter.jl compiles in LaTeX after merge. so it's fine. the markdown don't do it.

[KirillZubov]

the same in main branch https://github.com/SciML/NeuralPDE.jl/blob/master/docs/src/pinn/2D.md but in docs it is already compiled

[vpuri3]

Thanks. Where can I upload the image?

[vpuri3]

Nevermind. Dragging and dropping into the markdown worked!

[vpuri3]

@ChrisRackauckas , I think this commit is ready to merge.

[ChrisRackauckas]

Yeah, just put images into the github and then use ![](url_to_image) to put it into the docs.

[ChrisRackauckas]

We should really find a good way to do such a coordinate transformation automatically symbolically.