Initial document contributions.

README.md

-# oceandsl-java-tools
+# OceanDSL Jvava Tools
 
 Project containing all Java-based tools developed in OceanDSL.
+
+## Build
+
+`./gradlew build`
+
+## Execute
+
+Each tool has its own set of parameters and can be found in
+`doc/tools/$TOOL_NAME`.
+
+Current tools:
+- rewrite-log-entries
+- create-architecture-model
+
+
+
+
+
+