add Java DSL to help Java users

Author: pjfanning

src/main/java/tools/jackson/module/scala/javadsl/DefaultScalaModule.java

@@ -0,0 +1,7 @@
+package tools.jackson.module.scala.javadsl;
+
+public final class DefaultScalaModule {
+    public static tools.jackson.module.scala.JacksonModule getInstance() {
+        return tools.jackson.module.scala.DefaultScalaModule$.MODULE$;
+    }
+}

src/main/java/tools/jackson/module/scala/javadsl/ScalaModule.java

@@ -0,0 +1,7 @@
+package tools.jackson.module.scala.javadsl;
+
+public final class ScalaModule {
+    public static tools.jackson.module.scala.ScalaModule.Builder builder() {
+        return tools.jackson.module.scala.ScalaModule$.MODULE$.builder();
+    }
+}