[BAEL-1615] Code to support article. (#3867)

* [BAEL-1615] Code to support article.

* Adding example of provides...with

* Adding uses to main module

core-java-9/src/simple-modules/hello.modules/com/baeldung/modules/hello/HelloInterface.java

@@ -0,0 +1,5 @@
+package com.baeldung.modules.hello;
+
+public interface HelloInterface {
+    public void sayHello();
+}

core-java-9/src/simple-modules/hello.modules/com/baeldung/modules/hello/HelloModules.java

@@ -0,0 +1,11 @@
+package com.baeldung.modules.hello;
+
+public class HelloModules implements HelloInterface {
+    public static void doSomething() {
+        System.out.println("Hello, Modules!");
+    }
+
+    public void sayHello() {
+        System.out.println("Hello!");
+    }
+}

core-java-9/src/simple-modules/hello.modules/module-info.java

@@ -0,0 +1,4 @@
+module hello.modules {
+    exports com.baeldung.modules.hello;
+    provides com.baeldung.modules.hello.HelloInterface with com.baeldung.modules.hello.HelloModules;
+}