- Added implementation for Enum and Map

- Moving the CustomClass to data folder.
- Removing JSONBuilder.java
- Moving the implementation of JSONBuilder to JSONObject.

src/test/java/org/json/junit/data/CustomClassI.java

@@ -0,0 +1,12 @@
+package org.json.junit.data;
+
+import java.util.Map;
+
+public class CustomClassI {
+    public Map<String, Map<String, Integer>> integerMap;
+
+    public CustomClassI() {}
+    public CustomClassI(Map<String, Map<String, Integer>> integerMap) {
+        this.integerMap = integerMap;
+    }
+}