Create Readme.md

Author: ArneLimburg

README.md

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+# Api Versioning
+Showcase to demonstrate the implementation of backward-compatible APIs and versioning
+
+Run
+```
+cd customer-service
+mvn package meecrowave:run
+```
+to run the sample.
+After the server is running, you can access the Swagger UI at
+http://localhost:8080/index.html
+
+The sample was used during a webinar of open knowledge GmbH.
+The recording (in german) can be found here: https://youtu.be/4y6VJOq9jSY