Update README.md

Author: mikesamuel

README.md

@@ -12,12 +12,24 @@ This code was written with security best practices in mind, has an
 extensive test suite, and has undergone
 [adversarial security review](docs/attack_review_ground_rules.md).
 
+## Table Of Contents
+
+* [Getting Started](#getting-started)
+* [Prepackaged Policies](#prepackaged-policies)
+* [Crafting a policy](#crafting-a-policy)
+* [Custom policies](#custom-policies)
+* [Preprocessors](#preprocessors)
+* [Telemetry](#telemetry)
+* [Questions\?](#questions)
+* [Contributing](#contributing)
+* [Credits](#credits)
+
 ## Getting Started
 
 [Getting Started](docs/getting_started.md) includes instructions on
 how to get started with or without Maven.
 
-## Prepackage Policies
+## Prepackaged Policies
 
 You can use
 [prepackaged policies](https://static.javadoc.io/com.googlecode.owasp-java-html-sanitizer/owasp-java-html-sanitizer/20190325.1/org/owasp/html/Sanitizers.html):