Update STEPBYSTEP.md

Author: cwahl-Treeptik

STEPBYSTEP.md

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+# Step by step guide
+
+You can build this architecture step by step, so as to better understand it. The solutions can be found in the `stepx` repositories.
+
+
+## Step 1
+(This container is defined in the [step1] repository.)
+
+We want to deploy a simple helloworld application. We need java to be installed and the tomcat servlet to run.
+
+For the sake of simplicity, let us do it in a single container. It loads the binaries, copies the `helloworld.war` archive in the `tomcat-bin/webapps` repository and starts tomcat.