add license

package.xml

@@ -13,7 +13,7 @@
   <!-- One license tag required, multiple allowed, one license per tag -->
   <!-- Commonly used license strings: -->
   <!--   BSD, MIT, Boost Software License, GPLv2, GPLv3, LGPLv2.1, LGPLv3 -->
-  <license>TODO</license>
+  <license>BSD</license>
 
 
   <!-- Url tags are optional, but multiple are allowed, one per tag -->