added strategy pattern sample

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

@@ -0,0 +1,10 @@
+package com.iluwatar;
+
+public class ProjectileStrategy implements DragonSlayingStrategy {
+
+	@Override
+	public void execute() {
+		System.out.println("You shoot the dragon with the magical crossbow and it falls dead on the ground!");
+	}
+
+}