Add Table of Contents

To comply with awesome list requirements

Author: streichsbaer

README.md

@@ -12,6 +12,11 @@ Supported by: [GuardRails.io](https://www.guardrails.io)
 </div>
 <br/>
 
+# Contents
+- [Tools](#tools)
+- [Educational](#educational)
+- [Other](#other)
+
 # Tools
 
 ## Web Framework Hardening
@@ -90,12 +95,12 @@ Supported by: [GuardRails.io](https://www.guardrails.io)
 
 - [Java Security Reporting](https://www.oracle.com/corporate/security-practices/assurance/vulnerability/reporting.html)
 
-# Contributing
+## Contributing
 
 Found an awesome project, package, article, or another type of resources related to Java Security? Open a pull request!
 Just follow the [guidelines](/CONTRIBUTING.MD). Thank you!
 
 
-# License
+## License
 
 [![CC0](http://mirrors.creativecommons.org/presskit/buttons/88x31/svg/cc-zero.svg)](http://creativecommons.org/publicdomain/zero/1.0/)