write a doc

lengine-compiler/README.md

@@ -6,6 +6,15 @@ For now, it's experimental. Compiler's structure is now stabilized, but, still g
 
 So far, all the implements allowed are under [../compiler-example](https://github.com/gkm2164/lengine/tree/master/compile-example)
 
+## What's new?
+2023-10-21 - Make LengineObject interface.
+
+Now the classes generated by compiler would have LengineObject type as interface.
+This means that from other JVM codes, it can execute LengineObject by calling `scriptMain()` method.
+Also, to use the scripts code, you can call with `lengineObject.importSymbol(LengineString.create("someSymbolName"))`
+This, actually, wasn't intended to have compatibility, but,
+mostly to increase the performance on imports from other lengine code.
+
 ## How to test?
 
 Create your own `lg` file.