Added Javadoc to strategy pattern interfaces and implmentation

Author: roshan7432

strategy/src/main/java/com/iluwatar/strategy/DragonSlayingStrategy.java

@@ -26,7 +26,12 @@
 
 /** Strategy interface. */
 @FunctionalInterface
+/**
+ * Strategy interface for slaying a dragon.
+ */
 public interface DragonSlayingStrategy {
-
+  /**
+   * Execute the dragon slaying strategy.
+   */
   void execute();
 }

strategy/src/main/java/com/iluwatar/strategy/MeleeStrategy.java

@@ -28,6 +28,9 @@
 
 /** Melee strategy. */
 @Slf4j
+/**
+ * A strategy where the dragon is slain using a melee weapon (sword).
+ */
 public class MeleeStrategy implements DragonSlayingStrategy {
 
   @Override