[New] Added new StringMapArgument for StrolchServices

li.strolch.service/src/main/java/li/strolch/service/StringMapArgument.java

@@ -0,0 +1,11 @@
+package li.strolch.service;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import li.strolch.service.api.ServiceArgument;
+
+public class StringMapArgument extends ServiceArgument {
+	private static final long serialVersionUID = 1L;
+	public Map<String, String> map = new HashMap<>();
+}