[ToC] Add Table of Contents

Signed-off-by: Rob Dolin <[email protected]>

Author: RobDolinMS

versions/3.0.md

@@ -14,6 +14,20 @@ The OpenAPI Specification defines a set of files required to describe such an AP
 These files can then be used by the Swagger-UI project to display the API and Swagger-Codegen to generate clients in various languages.
 Additional utilities can also take advantage of the resulting files, such as testing tools.
 
+## Table of Contents
+<!-- TOC depthFrom:1 depthTo:3 withLinks:1 updateOnSave:1 orderedList:0 -->
+
+- [OpenAPI Specification](#openapi-specification)
+- [Introduction](#introduction)
+- [Table of Contents](#table-of-contents)
+- [Revision History](#revision-history)
+- [Definitions](#definitions)
+- [Specification](#specification)
+	- [Format](#format)
+	- [File Structure](#file-structure)
+
+<!-- /TOC -->
+
 ## Revision History
 
 Version | Date | Notes