Create basic content function

Signed-off-by: Justin Georgi <justin.georgi@gmail.com>

includes/AnnotationHooks.php

@@ -0,0 +1,33 @@
+<?php
+namespace MediaWiki\Extension\AnatImageViewer;
+
+use MediaWiki\MediaWikiServices;
+use RequestContext;
+use Html;
+use ParserOutput;
+
+class AnnotationHooks {
+    public static function registrationCallback() {
+        // Must match the name used in the 'ContentHandlers' section of extension.json
+        define( 'CONTENT_MODEL_ANNOTATION', 'annotation' );
+    }
+
+    /**
+     * Small helper function to display information on the browser console
+     * 
+     * Usage:
+     * echo '<script>';
+     * self::console_log('logged string');
+     * echo '</script>';
+     * 
+     * @param $data information to display
+     * @param bool $add_script_tags true to put information is inside complete script tag
+     */
+    public static function console_log($data, $add_script_tags = false) {
+        $command = 'console.log('. json_encode($data, JSON_HEX_TAG).');';
+        if ($add_script_tags) {
+            $command = '<script>'. $command . '</script>';
+        }
+        echo $command;
+    }
+}