Add instructions to test the image (#33)
Add instructions to test the image (#33)

* Add instructions to test the image

* language improvements

* Add documentation details on structure tests and link to dependencies installation

* Add instruction for integration tests

* Nits

GoogleCloudPlatform/tomcat-runtime,amohabir/tomcat-runtime,GoogleCloudPlatform/tomcat-runtime,GoogleCloudPlatform/tomcat-runtime,amohabir/tomcat-runtime,amohabir/tomcat-runtime