Add the Universal Differential Equation tutorials to this repo as tested examples

[ChrisRackauckas]

This will ensure that the code stays up to date.

[Spinachboul]

@ChrisRackauckas
Is this issue still open for work?

[ChrisRackauckas]

yes

[Spinachboul]

So should I add the examples for UDE in the following repo:
https://github.com/SciML/SciMLSensitivity.jl/tree/master/docs/src/examples

[ChrisRackauckas]

Yup. They will definitely need an update, but yes the updated / fixed versions should get turned into examples there.