Doc: Expose information about openapi tooling (#431)

Author: wtrocki

tools/README.md

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+# OpenAPI Tools for MongoDB Atlas
+
+Folder contains essential tools and workflows for managing MongoDB Atlas API specifications and their integration with development tools like Postman and Spectral. Below is a summary of the functionalities provided in the subfolders:
+
+## Postman
+
+Includes resources and scripts to generate [MongoDB Atlas Postman Collections](https://www.mongodb.com/developer/products/atlas/admin-api-postman/) from OpenAPI specifications. 
+
+## Spectral
+
+MongoDB [Spectral](https://github.com/stoplightio/spectral) OpenAPI specification validation rules
+
+## CLI
+
+OpenAPI CLI. Internal MongoDB CLI used for OpenAPI transformations.