update readme

Author: cowtowncoder

README.md

@@ -5,4 +5,15 @@ This project contains simple set of performance micro-benchmarks, using excellen
 
 # Status
 
-Somewhat experimental. But has been used with success in optimizing Jackson 2.4 release!
+Has been used since Jackson 2.4 to track performance changes: see various `results-pojo-2.x-home.txt`
+files for numbers.
+
+Tests usually run with
+
+    profile-mediaitem.sh
+
+or directly with something like
+
+    java -Xmx256m -jar target/microbenchmarks.jar ".*StdReadAfter.*PojoMediaItem.*" -wi 4 -w 1 -i 5 -r 1 -f 3 -t 1
+
+(see `results-pojo-2.13-home.txt` and others for specific invocations used for each group of numbers)