Create initial Class Library structure (`java.base` module)

[LunaStev]

Set up the initial Class Library (ClassLib) structure for AriaJDK.
This library will serve as the java.base module — the foundation of all other modules in the JDK.
The implementation will be written in Kotlin, serving as the source for the compiled .class files loaded by the Aria JVM runtime.

This issue focuses on creating the directory structure and adding placeholder (dummy) Kotlin files for the most fundamental classes, ensuring that the JVM can locate basic classes like java.lang.Object, java.lang.String, and java.lang.System.

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Tasks

• Create directory structure under classlib/src/main/kotlin/java/lang/
• Add the following placeholder Kotlin classes:
  • Object.kt
  • System.kt
  • String.kt
• Ensure each class compiles successfully into .class files
• Verify that the build process (x.py or Gradle) includes the generated classes inside the java.base module
• Update the README (if needed) to describe the ClssLib layout

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Example structure

classlib/
 └── src/
     └── main/
         └── kotlin/
             └── java/
                 └── lang/
                     ├── Object.kt
                     ├── String.kt
                     └── System.kt

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Acceptance Criteria

• The classlib module builds without errors
• The directory structure for java.base is correctly generated
• Object, String, and System placeholder classes exist and compile

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Notes

• No functionality is required yet — empty or minimal class definitions are sufficient (e.g., class Object {} in Kotlin).
• The purpose is to establish a clean, standardized layout for future contributions to the standard library.