Add a module-info file for the core module

Author: jeff5

core/src/main/java/module-info.java

@@ -0,0 +1,28 @@
+// Copyright (c)2025 Jython Developers.
+// Licensed to PSF under a contributor agreement.
+/**
+ * The Jython core classes and API as a module.
+ *
+ * The intention for the core module (jython-core JAR) is that is
+ * contain all that a developer would depend on to embed Jython or
+ * write an extension module, mixing their own Java and Python code.
+ * It will export several packages as API (and keep some packages to
+ * itself).
+ */
+module org.python.core {
+
+    // For now, before any restructuring, we just export all the modules
+    exports org.python.base;
+    exports org.python.core;
+    exports org.python.core.stringlib;
+    exports org.python.modules;
+
+    // The intended structure is more like this
+    // exports org.python.runtime;
+    // exports org.python.support;
+
+    // We require SLF4 logging API and ASM
+	requires transitive org.slf4j;
+	requires org.objectweb.asm;
+	requires org.objectweb.asm.tree;
+}