Instructions for OPENAI_API_KEY as env var and in IDEs (#1042)

README.md

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 > ✨ Navigate at [cookbook.openai.com](https://cookbook.openai.com)
 
-Example code and guides for accomplishing common tasks with the [OpenAI API](https://platform.openai.com/docs/introduction). To run these examples, you'll need an OpenAI account and associated API key ([create a free account here](https://beta.openai.com/signup)).
+Example code and guides for accomplishing common tasks with the [OpenAI API](https://platform.openai.com/docs/introduction). To run these examples, you'll need an OpenAI account and associated API key ([create a free account here](https://beta.openai.com/signup)). Set an environment variable called `OPENAI_API_KEY` with your API key. Alternatively, in most IDEs such as Visual Studio Code, you can create an `.env` file at the root of your repo containing `OPENAI_API_KEY=<your API key>`, which will be picked up by the notebooks.
 
 Most code examples are written in Python, though the concepts can be applied in any language.