Added index.md

Added index.md with explanation which seems a little bit short of detail.
Fixed the directory of the files.

value-object/src/test/java/com/iluwatar/value/object/HeroStatTest.java

@@ -0,0 +1,23 @@
+package com.iluwatar.value.object;
+
+import com.google.common.testing.EqualsTester;
+
+import org.junit.Test;
+
+/**
+ * Unit test for HeroStat.
+ */
+public class HeroStatTest {
+
+  /**
+   * Tester for equals() and hashCode() methods of a class.
+   * @see http://www.javadoc.io/doc/com.google.guava/guava-testlib/19.0
+   */
+  @Test
+  public void testEquals() {
+    HeroStat heroStatA = HeroStat.valueOf(3, 9, 2);
+    HeroStat heroStatB = HeroStat.valueOf(3, 9, 2);
+    new EqualsTester().addEqualityGroup(heroStatA, heroStatB).testEquals();
+  }
+
+}