chore(spring-keycloak-example): add README.md

Author: igorcampos-dev

spring-keycloak-example/README.md

@@ -0,0 +1,30 @@
+# spring-keycloak-example
+
+---
+
+## Overview
+
+Basic Java Spring (Java 21) project demonstrating integration with **Keycloak** for authentication and authorization.  
+Includes a minimal setup for running a Spring Boot application secured by Keycloak (via OAuth2/OpenID Connect), suitable for local development and testing.
+
+---
+
+## Tech stack
+
+- Spring Boot
+- Java 21
+- Keycloak (Docker)
+
+---
+
+## Authentication Types Implemented
+
+- nothing
+
+---
+
+## Related Resources
+
+| Description                     | Link                                                                  |
+|---------------------------------|-----------------------------------------------------------------------|
+| Running Keycloak in a container | [keycloak.org/containers](https://www.keycloak.org/server/containers) |