Add OpenMetrics scrape validator to OpenMetrics compliance readme

Noticed the OpenMetrics scrape validator tool was not directly linked from the readme, adding this for others to more easily discover.

openmetrics/README.md

@@ -2,6 +2,10 @@
 
 While [OpenMetrics](https://openmetrics.io/) is an independent CNCF project, Prometheus designated it as the [official specification](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md) for Prometheus exposition. OpenMetrics is, and will remain, closely aligned to Prometheus.
 
-The test suite can be found on [GitHub](https://github.com/OpenObservability/OpenMetrics/tree/main/src/cmd/openmetricstest). Depending on your implementation, the [individual test cases](https://github.com/OpenObservability/OpenMetrics/tree/main/tests/testdata/parsers) might be of direct interest.
+The test suite can be found on [GitHub](https://github.com/OpenObservability/OpenMetrics/tree/main/src/cmd/openmetricstest). 
+
+Depending on your implementation, the following might be of interest:
+- [Scrape validator tool](https://github.com/OpenObservability/OpenMetrics/tree/main/src/cmd/scrapevalidator) to scrape an OpenMetrics HTTP endpoint and validate the exposition against the OpenMetrics specification.
+- [Individual test cases](https://github.com/OpenObservability/OpenMetrics/tree/main/tests/testdata/parsers) to understand valid and invalid OpenMetric expositions.
 
 Prometheus considers OpenMetrics compliance part of Prometheus compliance and compatibility.