Add documentation comments for OpenAI Chat model (#8)

Author: mattjohnsonpint

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Update OpenAI Embeddings model to support all allowed types of input [#6](https://github.com/hypermodeAI/models-as/pull/6)
 - More updates for OpenAI Embeddings model [#7](https://github.com/hypermodeAI/models-as/pull/7)
+- Add documentation comments for OpenAI Chat model [#8](https://github.com/hypermodeAI/models-as/pull/8)
 
 ## 2024-06-28 - Version 0.1.6