Include the correct README.md

We missed the correct README in the addons/gd-openai.

The UX is much better that it was in v0.2.0

Make UX better

There are now better instructions and form to enter the API key.

v0.2.0

Add missing image generator example.

#9

v0.1.0

With this version your can use 3 API endpoints to ask for models, do a ChatGPT session and generate DALL-E images.