Add java11-features module: runnable demos and captured output for the ankurm.com java11-features article

java11-features/broken/JaxbRemoved.java

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+import javax.xml.bind.JAXBContext;
+
+/** Compiles on 8, fails on 11: JEP 320 removed the Java EE modules (java.xml.bind and friends). */
+public class JaxbRemoved {
+    public static void main(String[] args) throws Exception {
+        System.out.println(JAXBContext.class.getName());
+    }
+}

java11-features/broken/VarWithoutLambda.java

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+import java.util.function.BiFunction;
+
+/** Fails to compile on purpose: you cannot mix var and explicit types in one lambda's parameters. */
+public class VarWithoutLambda {
+    public static void main(String[] args) {
+        BiFunction<Integer, Integer, Integer> f = (var a, Integer b) -> a + b;
+        System.out.println(f.apply(1, 2));
+    }
+}