Write a tutorial for how to find areas of PHP to test

[ramsey]

[ramsey]

Might need to work with some core developers to help identify areas in PHP core that we can put into a list for groups to claim.

[ramsey]

Add each of these areas (maybe with links to gcov and PHP source code) as individual issues for people to claim on the https://github.com/phpcommunity/phptestfest-php-src repo.

[ramsey]

Look in the PHP bug tracker to try to reproduce bugs and write tests to confirm them (using --XFAIL--). https://bugs.php.net/