display names listed in credits.txt from /credits

mod/credits.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Show a credits page for all the developers who helped with the project
+ * (only contributors to the git repositories for friendica core and the
+ * addons repository will be listed though ATM)
+ */
+
+function credits_content (&$a) {
+    /* fill the page with credits */
+    $f = fopen('util/credits.txt','r');
+    $names = fread($f, filesize('util/credits.txt'));
+    $arr = explode("\n", htmlspecialchars($names));
+    fclose($f);
+    $tpl = get_markup_template('credits.tpl');
+    return replace_macros( $tpl, array(
+       '$pagetitle'		=> t('Credits'),
+       '$thanks'		=> t('Friendica is a community project, that would not be possible without the help of many people. Here is a list of those who have contributed to the code or the translation of Friendica. Thank you all!'),
+       '$names'         => $arr,
+    ));
+}