Is it possible to add inline image?

> Please provide us with the following information:
> ---------------------------------------------------------------

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

### Minimal steps to reproduce
> none

### Any log messages given by the failure
> none

### Expected/desired behavior
> For my case, I want to send an email with header/footer, both are inline images, I did not find any api to support it, is it possible to do so?

### OS and Version?
> Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

### Versions
> any

### Mention any other details that might be useful

> ---------------------------------------------------------------
> Thanks! We'll be in touch soon.

No file, test, or entry point is identified in the issue. Start by locating the Java quickstart and the Azure Communication Services email API entry point relevant to sending messages with inline header and footer images. Done would require a documented, agreed implementation path and verification of the supported behavior.

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