Lot of example directory structure refactoring. (0.39.9).

examples/io/file_io.fun

@@ -0,0 +1,32 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2025 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ */
+
+/*
+ * File Input/Output Examples
+ *
+ * Demonstrates:
+ * - Reading from files with `open`
+ * - Writing to output files
+ * - Working with file streams and handles
+ * - Error handling during I/O operations
+ */
+
+// file I/O (writes then reads)
+path = "./tmp/fun_io_example.txt"
+ok = write_file(path, "hello-io")
+print(ok)                        // -> 1
+content = read_file(path)
+print(content)                   // -> hello-io
+
+/* Expected output:
+1
+hello-io
+*/