Added samples for annotation processing article. (#705)

* Added annotation processing examples. Fixed core-java8 build on OS X

* Moved projects to separate submodule

annotations/annotation-user/src/main/java/com/baeldung/annotation/Person.java

@@ -0,0 +1,29 @@
+package com.baeldung.annotation;
+
+import com.baeldung.annotation.processor.BuilderProperty;
+
+public class Person {
+
+    private int age;
+
+    private String name;
+
+    public int getAge() {
+        return age;
+    }
+
+    @BuilderProperty
+    public void setAge(int age) {
+        this.age = age;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    @BuilderProperty
+    public void setName(String name) {
+        this.name = name;
+    }
+
+}