Document how to build samples in CONTRIBUTING.md
See
@@ -47,6 +47,12 @@ To build the source you will need Java 8 or later. The code is built with Gradle
$ ./gradlew build
```
+To build the samples, run the following command:
+
+```
+$ ./gradlew buildSamples
+```
+
### Importing into Eclipse
The project has Gradle's Eclipse plugin applied. Eclipse project and classpath metadata
