Add note about PHP version compatibility.

laurynas · Jan 1, 2021 · 71fac9b · 71fac9b
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 PHP Crossword
 =============
 
+**This project is no longer maintained. It does not work with the latest PHP versions.
+Latest compatible version is PHP4, you can run it on Docker.
+There is also [a fork compatible with PHP 5.6](https://github.com/dFelinger/php-crossword).**
+
 PHP Crossword is PHP and MySQL based crossword generator.
 
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