Add Core extensions

php_modules/zlib/README.md

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+# zlib
+
+This module enables you to transparently read and write gzip (.gz) compressed files, through versions of most of the filesystem functions which work with gzip-compressed files (and uncompressed files, too, but not with sockets).
+
+| Platform | Url                                                              |
+|----------|------------------------------------------------------------------|
+| PHP.net  | https://www.php.net/manual/en/book.zlib.php                      |