More detailled documentation of the REST API of MAA

### 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)
```
Hello,

I really appreciate the work and have been able to run the sample on an ACC VM.

However, I would like to understand better how the REST API of Microsoft Azure Attestation works, but there is little documentation on it either on the docs (https://docs.microsoft.com/en-us/azure/attestation/overview) or on https://docs.microsoft.com/en-us/rest/api/attestation/

Could the process be described in more details? I more or less get how it works by reading the C# code, but a more explained documentation, with maybe a Python implementation could really help me.

Thank you