Add Bitdeli Badge to readme

Author: Kamil Kisiela

README.md

@@ -48,4 +48,6 @@ _rest of angular-material directive in near future_
 - add md-radio-button and md-radio-group
 - add md-select
 - e2e tests
-- Requests (?). Post an issue.
+- Requests (?). Post an issue.
+
+[![Bitdeli Badge](https://d2weczhvl823v0.cloudfront.net/wieldo/angular-formly-templates-material/trend.png)](https://bitdeli.com/free "Bitdeli Badge")