Add a HACKING file to describe the coding style used in the project

diff --git a/HACKING b/HACKING
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+++ b/HACKING
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+The code follows the Drupal coding standards:
+https://www.drupal.org/coding-standards
+
+Style compliance can be checked using the Coder Sniffer extension to the PEAR
+PHP_CodeSniffer project, for instructions about how to install Coder Sniffer
+see https://www.drupal.org/node/1419988
+
+Use this command to check the style:
+
+  $ phpcs --standard=Drupal .