Create README.md

Author: saturnism

groovy-onbuild/README.md

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+This project contains Dockerfile that creates a base image to run Spring Boot applications.
+
+This is not an official Google product.
+
+How to use this image
+=====================
+
+Groovy Applications
+-------------------
+Create a Dockerfile in your project directory:
+
+    FROM saturnism/spring-boot:1.2.3-jdk-8-groovy-2.4.3
+    ADD . $SRC_DIR
+
+You can then build and run the image:
+
+    docker build -t myapp
+    docker run -ti myapp
+
+You'll notice that everytime the container starts, it will resolve all the dependencies.
+To avoid this, you can also pre-compile your Groovy application using the `onbuild` image.
+
+In the Dockerfile, use:
+
+    FROM saturnism/spring-boot:1.2.3jdk-8-groovy-2.4.3-onbuild
+
+You can then build and run the image just like the previous method:
+
+    docker build -t myapp
+    docker run -ti myapp
+
+
+Examples
+--------
+You can find examples under the [Examples](examples/) directory.