Add basic read me to php

frameworks/PHP/README.md

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+# Tricks to writing PHP-based Frameworks
+
+Many servers use the `php`, `php-fpm`, or other binaries. If your
+server launches with `sudo` (e.g. `sudo php-fpm`) then you should be 
+aware that sudo resets the `$PATH` environment variable, and your 
+specific binary may not be the one being used. The solution is to 
+always use `sudo <full-path-to-my-binary>`. For example, `cakephp`'s
+`bash_profile.sh` sets the variable `$PHP_FPM` to be the full path 
+to the `php-fpm` binary that `cakephp` wants, and then uses `sudo $PHP_FPM`
+to ensure that the `php-fpm` binary used by sudo is the exact binary 
+desired.