Add CustomGPT Action article for Tray.ai

[kylecote-tray]

Summary

• Add CustomGPT Actions via API Management with Tray.ai markdown
• Add cookbook reference for new markdown
• Gifs of creating custom API creation & credential management to be used in your Custom GPT

Motivation

When building a CustomGPT, you'll want to hit multiple systems and may want to re-use these individual actions across different CustomGPTs. Tray.ai can do this with API Management (APIM) in which you can create API operations with structured inputs and outputs and interface with multiple 3rd party systems without having to worry about authentication governance inside your CustomGPT. This has tremendous value in isolating all of your actions under a single API.

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[kwhinnery-openai]

Can we fix the filename here? Thanks!