Updated examples

[arwelHughes]

Makes a new set of examples for using the toolbox.

[DrPaulSharp]

All looks good in general, but a bit of tidying up and resolving inconsistencies will help show the code off best.

In addition to the specific comments:

• There is no README for Domains/CustomXY
• There is mixed use of camelCase and snake_case for directories and variables
• The file "Normal_Reflectivity/Custom_XY/customDSPC.m" refers to old variables in the project - is this the correct version of the file?
• "testExamples.m" should be replaced with a new version, rather than just deleted.

[DrPaulSharp]

Seems fine, just a few specific things to look at. I'd also ask again about the use of snake case for the directory names in the examples directory - should these not be camel case like the rest of the code?

[StephenNneji]

Seems fine, just a few specific things to look at. I'd also ask again about the use of snake case for the directory names in the examples directory - should these not be camel case like the rest of the code?

I left it snake case for readability but folder names are simple enough so I will change to camel case for consistency.