restore the javadoc

Author: peter-lawrey

src/main/java/net/openhft/compiler/internal/package-info.java

@@ -1,4 +1,19 @@
 /*
  * Copyright 2013-2025 chronicle.software; SPDX-License-Identifier: Apache-2.0
  */
+/**
+ * This package and any and all sub-packages contains strictly internal classes for this Chronicle library.
+ * Internal classes shall <em>never</em> be used directly.
+ * <p>
+ *  Specifically, the following actions (including, but not limited to) are not allowed
+ *  on internal classes and packages:
+ *  <ul>
+ *      <li>Casting to</li>
+ *      <li>Reflection of any kind</li>
+ *      <li>Explicit Serialize/deserialize</li>
+ *  </ul>
+ * <p>
+ * The classes in this package and any sub-package are subject to
+ * changes at any time for any reason.
+ */
 package net.openhft.compiler.internal;