feat(java15): Add demo placeholder for JEP 372 Nashorn Removal

src/main/java/org/javademos/init/Java15.java

@@ -4,6 +4,7 @@
 
 import org.javademos.commons.IDemo;
 import org.javademos.java15.jep360.SealedClassesDemo;
+import org.javademos.java15.jep372.NashornRemovalDemo;
 import org.javademos.java15.jep375.InstanceofPatternMatchingSecondPreview;
 import org.javademos.java15.jep381.SolarisSparcRemovalDemo;
 import org.javademos.java15.jep383.ForeignMemoryAccessDemo;
@@ -20,6 +21,8 @@ public static ArrayList<IDemo> getDemos() {
 
         // JEP 360
         java15DemoPool.add(new SealedClassesDemo());
+        // JEP 372
+        java15DemoPool.add(new NashornRemovalDemo());
         // JEP 375
         java15DemoPool.add(new InstanceofPatternMatchingSecondPreview());
         // JEP 381

src/main/java/org/javademos/java15/jep372/NashornRemovalDemo.java

@@ -0,0 +1,30 @@
+package org.javademos.java15.jep372;
+
+import org.javademos.commons.IDemo;
+
+/// ## JEP 372: Remove the Nashorn JavaScript Engine
+///
+/// ### History
+/// Nashorn was introduced in Java 8 (JEP 174) as a replacement for the older
+/// Rhino engine. However, with the rapid evolution of ECMAScript (JavaScript),
+/// maintaining Nashorn became difficult. It was deprecated in Java 11 (JEP 335)
+/// and removed entirely by this JEP.
+///
+/// ### Links
+/// - [Official JEP 372](https://openjdk.org/jeps/372)
+///
+/// @since Java 15
+public class NashornRemovalDemo implements IDemo {
+
+    @Override
+    public void demo() {
+        // Call info helper
+        info(372);
+
+        // This JEP removed the Nashorn JavaScript engine, APIs, and the jjs tool.
+        // There are no specific APIs or language features to demonstrate its absence.
+        // Trying to import or use classes from the jdk.nashorn package would now
+        // result in a compilation error. For example:
+        // import jdk.nashorn.api.scripting.NashornScriptEngineFactory; // This import fails in JDK 15+
+    }
+}

src/main/resources/JDK15Info.json

@@ -1,4 +1,11 @@
 [ {
+    "jep": 372,
+    "info": {
+      "name": "JEP 372 - Remove the Nashorn JavaScript Engine",
+      "dscr": "Remove the Nashorn JavaScript script engine, APIs, and the jjs tool. No code demo applicable as the feature was removed."
+    }
+  },
+{
     "jep": 375,
     "info": {
       "name": "JEP 375 - Pattern Matching for instanceof (Second Preview)",