Segmentation API - Audience Composition

### Expected Behaviour
Have examples of how to use the API to manage Audience Compositions
### Actual Behaviour
Currently, there aren't examples of how to use the API to manage Audience Compositions
### Reproduce Scenario (including but not limited to)
How to create and remove Audience Compositions by API
#### Steps to Reproduce

#### Platform and Version
AEP
#### Sample Code that illustrates the problem

#### Logs taken while reproducing problem

Start by inspecting the repository's existing API samples and conventions for Audience Compositions. Add examples showing how to create and remove Audience Compositions through the API; the work is done when both operations are documented with usable sample requests.

Written by the indexing model from the issue text.