Add REST API and Golang Examples for Sending Emails/Others via Azure Communication Services

there are examples for JS and .net like communication-services-javascript-quickstarts
## Description
There is a noticeable lack of detailed examples and documentation for using the REST API and Golang with Azure Communication Services to send emails. This issue aims to request the creation of comprehensive guides and examples similar to the existing JavaScript quickstarts, but tailored for Golang and REST API usage.

## Issue Type
- [x] feature request

## Minimal Steps to Reproduce
Not applicable as this is a documentation and example request.

## Log Messages
Not applicable.

## Expected/Desired Behavior
Provision of REST API examples and Golang documentation that includes:
- Authentication methods
- Request headers and bodies setup
- Response handling

## OS and Version
Not applicable.

## Versions
Not applicable.

## Additional Details
These resources will enable developers to integrate email functionalities using Golang or direct API calls effectively, enhancing the utility of Azure Communication Services in diverse development environments.

Beginne damit, die vorhandenen JavaScript-Schnellstarts in diesem Repository und die Dokumentation zur Azure Communication Services-E-Mail-REST-API zu prüfen. Erstelle vergleichbare Go- und REST-Beispiele, die Authentifizierung, Request-Header und -Bodies sowie die Verarbeitung von Responses abdecken. Erledigt ist die Aufgabe, wenn die neuen Beispiele und die Dokumentation klar zeigen, wie über beide Schnittstellen E-Mails gesendet werden.

Vom Indexierungsmodell aus dem Issue-Text verfasst.