Request to add Fileupload support

[AgentSmithers]

Hi, Hope your doing well. I have generated the code to implement file upload support with OpenAI. Would you be interested in merging the code to add FileUpload support to your library? I'd be glad to work with you now that I have a POC fully working.
if your interested
Nicholas {AT] DesertComputerAgents (Dot] !com>

Im sure we can knock it out in a single convo. Youll get a auto response from my email, you can disregard it.

[gotmike]

@AgentSmithers -- we have two PRs waiting on code review... feel free to take and opine on suitability.
#34
#22

[OkGoDoIt]

File upload support has been added in #22 thanks to @gmilano!

api.Files.UploadFileAsync(string filePath)

I'll get an updated package on Nuget within the next few days most likely, look for v1.4 soon. Or download latest from master here.