Add german DB API

README.md

@@ -59,6 +59,7 @@ A collective list of JSON APIs for use in web development.
 |---|---|---|---|
 | Transport for London | TFL API | No | [Go!](https://api.tfl.gov.uk) |
 | Transport for Belgium | Belgian transport API | No | [Go!](https://hello.irail.be/api/) |
+| Transport for Germany | Deutsche Bahn (DB) API | No | [Go!](http://data.deutschebahn.com/apis/fahrplan/) |
 
 ### Development