Adding readme

examples/rest-mp-metrics/README.md

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+# Microprofile Metrics
+This is an example on how to use microprofile metrics in TomEE.
+
+The command to run the application the application is:
+
+    mvn clean install tomee:run 
+
+Make a call to the greeting endpoint: 
+
+    http://localhost:8080/rest-mp-metrics/greeting
+
+Check the metrics in Prometheus format:
+
+    http://localhost:8080/rest-mp-metrics/metrics
+
+
+
+     
+