add javalin to supported libraries

Author: lucasamoroso

docs/supported-libraries.md

@@ -79,6 +79,7 @@ These are the supported libraries and frameworks:
 | [Java Executors](https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executor.html)                                              | Java 8+                            | N/A                                                                                                                                                                                                                                                                                                                                                                                     | Context propagation                                                                                                                     |
 | [Java Http Client](https://docs.oracle.com/en/java/javase/11/docs/api/java.net.http/java/net/http/package-summary.html)                     | Java 11+                           | [opentelemetry-java-http-client](../instrumentation/java-http-client/library)                                                                                                                                                                                                                                                                                                           | [HTTP Client Spans], [HTTP Client Metrics]                                                                                              |
 | [java.util.logging](https://docs.oracle.com/javase/8/docs/api/java/util/logging/package-summary.html)                                       | Java 8+                            | N/A                                                                                                                                                                                                                                                                                                                                                                                     | none                                                                                                                                    |
+| [Javalin](https://javalin.io/)                                                                                                              | 5.0.0+                             | N/A                                                                                                                                                                                                                                                                                                                                                                                     | Provides `http.route` [2]                                                                                                               |
 | [Java Platform](https://docs.oracle.com/javase/8/docs/api/java/lang/management/ManagementFactory.html)                                      | Java 8+                            | [opentelemetry-runtime-telemetry-java8](../instrumentation/runtime-telemetry/runtime-telemetry-java8/library),<br>[opentelemetry-runtime-telemetry-java17](../instrumentation/runtime-telemetry/runtime-telemetry-java17/library),<br>[opentelemetry-resources](../instrumentation/resources/library)                                                                                   | [JVM Runtime Metrics]                                                                                                                   |
 | [JAX-RS](https://javaee.github.io/javaee-spec/javadocs/javax/ws/rs/package-summary.html)                                                    | 0.5+                               | N/A                                                                                                                                                                                                                                                                                                                                                                                     | Provides `http.route` [2], Controller Spans [3]                                                                                         |
 | [JAX-RS Client](https://javaee.github.io/javaee-spec/javadocs/javax/ws/rs/client/package-summary.html)                                      | 1.1+                               | N/A                                                                                                                                                                                                                                                                                                                                                                                     | [HTTP Client Spans], [HTTP Client Metrics]                                                                                              |