docs: add root index mapping each lab to its origin repo

README.md

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+# jvm-labs
+
+Archive of small JVM experiments, one lab per directory. Each lab was its own
+repository and keeps its full commit history and its own build root — there is
+deliberately no parent aggregator POM, so every lab stays standalone.
+
+| Lab | Origin repo | What was tried |
+|---|---|---|
+| [quarkus/](quarkus/) | `try-quarkus` | Quarkus framework starter |
+| [micronaut/](micronaut/) | `try-micronaut` | Micronaut 4 framework starter |
+| [spring-boot/](spring-boot/) | `try-spring-boot` | Spring Boot with Couchbase |
+| [guice/](guice/) | `try-guice` | Google Guice dependency injection |
+| [event-bus/](event-bus/) | `try-event-bus` | Event-bus pattern |
+| [netty/](netty/) | `try-netty` | Netty 4 channel handlers (JSON / FlatBuffers packets) |
+| [resilience4j/](resilience4j/) | `try-resilience4j` | Resilience4j fault-tolerance demo |
+| [discord4j/](discord4j/) | `try-discord4j` | Discord4J bot starter |
+| [maven/](maven/) | `maven-copy-dependencies-example` | maven-dependency-plugin: copy dependencies into `lib/` |
+| [micrometer/](micrometer/) | `try-micrometer` | Micrometer metrics shipped into ELK |
+| [elk/](elk/) | `try-elk` | Logging with the ELK stack |
+| [loki/](loki/) | `try-loki` | Logging with Grafana Loki |
+| [graylog/](graylog/) | `try-graylog` | Logging with Graylog |