update README with community integrations/learning resources

Author: tobz

README.md

@@ -55,13 +55,18 @@ Overall, this repository is home to the following crates:
   serving a Prometheus scrape endpoint.
 * [`metrics-util`][metrics-util]: Helper types/functions used by the `metrics` ecosystem.
 
-# community integrations
+# community integrations and learning resources
 
 As well, there are also some community-maintained exporters and other integrations:
 
 * [`metrics-exporter-statsd`][metrics-exporter-statsd]: A `metrics`-compatible exporter for sending metrics via StatsD.
 * [`metrics-exporter-newrelic`][metrics-exporter-newrelic]: A `metrics`-compatible exporter for sending metrics to New Relic.
 * [`opinionated_metrics`][opinionated-metrics]: Opinionated interface to emitting metrics for CLI/server applications, based on `metrics`.
+* [`metrics-dashboard`][metrics-dashboard]: A dashboard for visualizing metrics from `metrics`.
+
+Additionally, here are some learning resource(s) to help you get started:
+
+* [Rust Telemetry Workshop][rust-telemetry-workshop] from [MainMatter](https://mainmatter.com/).
 
 ## MSRV and MSRV policy
 
@@ -91,3 +96,5 @@ We'd love to chat about any of the above, or anything else related to metrics. D
 [metrics-exporter-statsd]: https://docs.rs/metrics-exporter-statsd
 [metrics-exporter-newrelic]: https://docs.rs/metrics-exporter-newrelic
 [opinionated-metrics]: https://docs.rs/opinionated_metrics
+[metrics-dashboard]: https://docs.rs/metrics-dashboard
+[rust-telemetry-workshop]: https://github.com/mainmatter/rust-telemetry-workshop/tree/main/exercises/03_metrics