kotlin: README for examples

Author: mightyguava

examples/kotlin/README.md

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+# Kotlin examples
+
+This is a Kotlin gradle project configured to compile and test all examples. Currently tests have only been written for the `authors` example.
+
+To run tests:
+
+```shell script
+./gradlew clean test
+```
+
+The project can be easily imported into Intellij.
+
+1. Install Java if you don't already have it
+1. Download Intellij IDEA Community Edition
+1. In the "Welcome" modal, click "Import Project"
+1. Open the `build.gradle` file adjacent to this README file
+1. Wait for Intellij to sync the gradle modules and complete indexing