Add TODO comments for deprecation.

bindings/java/src/main/java/org/github/tursodatabase/Main.java

@@ -4,6 +4,9 @@ import org.github.tursodatabase.limbo.Connection;
 import org.github.tursodatabase.limbo.Cursor;
 import org.github.tursodatabase.limbo.Limbo;
 
+/**
+ * TODO: Remove Main class. We can use test code to verify behaviors.
+ */
 public class Main {
     public static void main(String[] args) throws Exception {
         Limbo limbo = Limbo.create();

bindings/java/src/main/java/org/github/tursodatabase/exceptions/ErrorCode.java

@@ -6,6 +6,7 @@ package org.github.tursodatabase.exceptions;
  * that may occur while communicating with the JNI.
  * <p />
  * Refer to ErrorCode in rust package.
+ * TODO: Deprecate
  */
 public class ErrorCode {
     public static int CONNECTION_FAILURE = -1;

bindings/java/src/main/java/org/github/tursodatabase/limbo/Connection.java

@@ -4,6 +4,7 @@ import java.lang.Exception;
 
 /**
  * Represents a connection to the database.
+ * TODO: Deprecate classes under limbo package. We leave this source code for reference.
  */
 public class Connection {
 

bindings/java/src/main/java/org/github/tursodatabase/limbo/Cursor.java

@@ -2,6 +2,7 @@ package org.github.tursodatabase.limbo;
 
 /**
  * Represents a database cursor.
+ * TODO: Deprecate classes under limbo package. We leave this source code for reference.
  */
 public class Cursor {
     private long cursorPtr;

bindings/java/src/main/java/org/github/tursodatabase/limbo/Limbo.java

@@ -4,6 +4,9 @@ import org.github.tursodatabase.exceptions.ErrorCode;
 
 import java.lang.Exception;
 
+/**
+ * TODO: Deprecate classes under limbo package. We leave this source code for reference.
+ */
 public class Limbo {
 
     private static volatile boolean initialized;