Update HRP geo file

inc/converter.php

@@ -1,5 +1,10 @@
 <?php
 
+/**
+ * To convert a gpx file:
+ * 1. Add file <file_name>.gpx to geo/ folder
+ * 2. Assign file to project: UPDATE projects SET geofile = '<file_name>.geojson'
+ */
 class Converter extends PhpObject {
 	
 	const GPX_EXT = '.gpx';