Help with generating new Guid's

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### This issue is for a: (mark with an `x`)
```
- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [ x] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
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Not needed
### Any log messages given by the failure
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Not applicable
### Expected/desired behavior
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### OS and Version?
> Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)
Windows 10
### Versions
>
20H2
### Mention any other details that might be useful

I'm would like to use a local copy of Information Protection Policy.json to add a couple of classifications more suitable to my business (I work at a University). I would like to add 'Academic' as a Label, then extend "InformationTypes" with an additional 'DisplayName' and key words patterns (additional regex's). However, I can't find any documentation or guidance on how to generate the new GUID's I think I need to set the new Classifications up. Can you advise please?

Thanks Tony

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