add javadoc

src/main/java/core/policy/EpsilonPolicy.java

@@ -1,5 +1,11 @@
 package core.policy;
 
+/**
+ * Chooses the action with the highest values with possibility: 1-Ɛ + Ɛ/|A|
+ * With possibility of Ɛ, a random action is taken (highest values option included).
+ *
+ * @param <A> Enum class of available action in specific environment
+ */
 public interface EpsilonPolicy<A extends Enum> extends Policy<A> {
     float getEpsilon();
     void setEpsilon(float epsilon);

src/main/java/core/policy/GreedyPolicy.java

@@ -6,6 +6,12 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 
+/**
+ * Always chooses the action with the highest value
+ * with ties broken arbitrarily.
+ *
+ * @param <A> Enum class of available action in specific environment
+ */
 public class GreedyPolicy<A extends Enum> implements Policy<A> {
 
     @Override

src/main/java/core/policy/Policy.java

@@ -2,6 +2,12 @@ package core.policy;
 
 import java.util.Map;
 
+/**
+ * Strategy to choose a specific action available in the agent's current
+ * state.
+ *
+ * @param <A> Enum class of available action in specific environment
+ */
 public interface Policy<A extends Enum> {
     A chooseAction(Map<A, Double> actionValues);
 }

src/main/java/core/policy/RandomPolicy.java

@@ -4,6 +4,11 @@ import core.RNG;
 
 import java.util.Map;
 
+/**
+ * Chooses an action arbitrarily.
+ *
+ * @param <A> Enum class of available action in specific environment
+ */
 public class RandomPolicy<A extends Enum> implements Policy<A>{
     @Override
     public A chooseAction(Map<A, Double> actionValues) {