Added some class documentation

MyEnum.java

@@ -1,5 +1,8 @@
 package org.json.junit;
 
+/**
+ * An enum with no methods or data
+ */
 public enum MyEnum {
     VAL1,
     VAL2,

MyEnumField.java

@@ -1,5 +1,8 @@
 package org.json.junit;
 
+/**
+ * An enum that contains getters and some internal fields
+ */
 public enum MyEnumField {
     VAL1(1, "val 1"),
     VAL2(2, "val 2"),

StringsResourceBundle.java

@@ -2,6 +2,9 @@ package org.json.junit;
 
 import java.util.*;
 
+/**
+ * A resource bundle class
+ */
 public class StringsResourceBundle extends ListResourceBundle {
     public Object[][] getContents() {
         return contents;

TestRunner.java

@@ -4,6 +4,10 @@ import org.junit.runner.JUnitCore;
 import org.junit.runner.Result;
 import org.junit.runner.notification.Failure;
 
+/**
+ * Invoke this class main method if you want to run unit tests from the
+ * command line. If successful, will print "true" to stdout.
+ */
 public class TestRunner {
    public static void main(String[] args) {
       Result result = JUnitCore.runClasses(JunitTestSuite.class);