add readme

Author: larscom

README.md

@@ -0,0 +1,7 @@
+# Bitvavo Java
+
+![Maven Central Version](https://img.shields.io/maven-central/v/io.github.larscom/bitvavo-java)
+[![workflow](https://github.com/larscom/bitvavo-java/actions/workflows/workflow.yml/badge.svg)](https://github.com/larscom/bitvavo-java/actions/workflows/workflow.yml)
+[![License MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+
+<br />