Update README.md

Author: nkiesel

kotest-jvm/README.md

@@ -1,3 +1,7 @@
 # kotest-jvm
 
 Example project showing how to use Kotest for JVM projects.
+
+This also has a `ProjectConfig` example that adds a line
+for every test output that shows the time it took to run
+that test when executing `./gradlew kotest --rerun`.