Doc: Expose information about openapi tooling

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 from OpenAPI specifications. 
+The automated process ensures that the Postman workspace is always synchronized with the latest API updates.
+
+## SPECTRAL
+
+This segment focuses on using Spectral for OpenAPI specification validation. 
+Any changes to rules or configuration in `.spectral.yaml` will automatically update OpenAPI validations across the MongoDB OpenAPI repository.
+
+## CLI
+
+OpenAPI CLI. Internal MongoDB CLI used for OpenAPI transformations.