add GraphQL for Pentesters blog post (#14)

Signed-off-by: Alexandre ZANNI <16578570+noraj@users.noreply.github.com>

README.md

@@ -95,6 +95,7 @@ A curated list of awesome GraphQL Security frameworks, libraries, software and r
 - [Access Control Best Practices for GraphQL with Authentication and Authorization](https://blog.escape.tech/authentication-authorization-access-control/) - Confusion between authentication and authorization causes data leaks. Learn the difference and how to implement the right access control pattern in your GraphQL API.
 - [Apollo Blog](https://www.apollographql.com/blog/graphql/security/9-ways-to-secure-your-graphql-api-security-checklist/) - Take your GraphQL skills to the next level with our free interactive GraphQL tutorials, videos, quizzes and code challenges.
 - [The GraphQL Security Blog](https://blog.escape.tech/9-graphql-security-best-practices/) - Learn about GraphQL security, performance, testing and building production-ready APIs with the latest tools and best practices of the GraphQL ecosystem.
+- [GraphQL for Pentesters](https://www.acceis.fr/graphql-for-pentesters/) - Introduction to Basic Concepts, Security Considerations & Reconnaissance, Vulnerabilities and Attacks, Offensive Tools.
 
 ### Vulnerabilities