add reference to EGo's MAA sample

[katexochen]

Purpose

• Add reference to EGo's Microsoft Azure Attestation sample code. EGo provides Go sample code to demonstrate Microsoft Azure Attestation as well as library functions for simple usage of Azure Attestation.

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Documentation content changes
[ ] Other... Please describe:

[katexochen]

@mssindhurid @gkostal Could I have your feedback on this PR?

[mssindhurid]

@mssindhurid @gkostal Could I have your feedback on this PR?

@katexochen - Thank you for the edits. The PR will be approved and we will place all customer code samples integrated with Azure Attestation under a separate heading