Add config method

Signed-off-by: Rahul Rudragoudar <rr83019@gmail.com>

src/main/java/lc/captchas/FontFunCaptcha.java

@@ -16,6 +16,10 @@ public class FontFunCaptcha implements ChallengeProvider {
     return "FontFunCaptcha";
   }
 
+  public void configure(String config) {
+    // TODO: Add custom config
+  }
+
   private String getFontName(String path, String level) {
     File file = new File(path + level + "/");
     FilenameFilter txtFileFilter =

src/main/java/lc/captchas/GifCaptcha.java

@@ -48,6 +48,10 @@ public class GifCaptcha implements ChallengeProvider {
     return null;
   }
 
+  public void configure(String config) {
+    // TODO: Add custom config
+  }
+
   public Challenge returnChallenge() {
     String secret = HelperFunctions.randomString(6);
     return new Challenge(gifCaptcha(secret), "image/gif", secret.toLowerCase());

src/main/java/lc/captchas/ShadowTextCaptcha.java

@@ -20,6 +20,10 @@ public class ShadowTextCaptcha implements ChallengeProvider {
     return "ShadowTextCaptcha";
   }
 
+  public void configure(String config) {
+    // TODO: Add custom config
+  }
+
   public boolean checkAnswer(String secret, String answer) {
     return answer.toLowerCase().equals(secret);
   }

src/main/java/lc/captchas/interfaces/ChallengeProvider.java

@@ -7,5 +7,5 @@ public interface ChallengeProvider {
 
   public boolean checkAnswer(String secret, String answer);
 
-  // TODO: def configure(): Unit
+  public void configure(String config);
 }

src/main/scala/lc/captchas/FilterChallenge.scala

@@ -10,6 +10,11 @@ import lc.captchas.interfaces.Challenge
 
 class FilterChallenge extends ChallengeProvider {
   def getId = "FilterChallenge"
+
+  def configure(config: String): Unit = {
+    // TODO: add custom config
+  }
+
   def returnChallenge(): Challenge = {
     val filterTypes = List(new FilterType1, new FilterType2)
     val r = new scala.util.Random

src/main/scala/lc/captchas/LabelCaptcha.scala

@@ -23,6 +23,10 @@ class LabelCaptcha extends ChallengeProvider {
 
   def getId = "LabelCaptcha"
 
+  def configure(config: String): Unit = {
+    // TODO: add custom config
+  }
+
   def returnChallenge(): Challenge =
     synchronized {
       val r = scala.util.Random.nextInt(knownFiles.length)

src/main/scala/lc/captchas/RainDropsCaptcha.scala

@@ -31,6 +31,10 @@ class RainDropsCP extends ChallengeProvider {
 
   def getId = "FilterChallenge"
 
+  def configure(config: String): Unit = {
+    // TODO: add custom config
+  }
+
   private def extendDrops(drops: Array[Drop], steps: Int, xOffset: Int) = {
     drops.map(d => {
       val nd = new Drop()