Jvm project config (#69)

* Add ProjectConfig to kotest-jvm

This gives a concrete example of how/where to add and configure ProjectConfig in JVM
projects.  The added config adds a test execution timer line to the `./gradlew kotest`
output.

* 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`.

kotest-jvm/src/test/kotlin/io/kotest/provided/ProjectConfig.kt

@@ -0,0 +1,15 @@
+package io.kotest.provided
+
+import io.kotest.core.config.AbstractProjectConfig
+import io.kotest.core.listeners.AfterTestListener
+import io.kotest.core.test.TestCase
+import io.kotest.engine.test.TestResult
+
+object TimerListener : AfterTestListener {
+    override suspend fun afterAny(testCase: TestCase, result: TestResult) =
+        println("- ${testCase.name.name} ${result.duration}")
+}
+
+object ProjectConfig : AbstractProjectConfig() {
+    override val extensions = listOf(TimerListener)
+}