Added some helpful links.

README.md

@@ -3,14 +3,16 @@
 # datasources
 
 Repository with the BridgeDb data source. The reason to abstract this out is that other tools no longer depend
-on updates of the BridgeDb Java library to use the information.
+on updates of the [BridgeDb Java](https://github.com/bridgedb/BridgeDb) library to use the information.
 
 The following URLs can be used in downstream tools:
 
 * [https://bridgedb.github.io/datasources/datasources.tsv](https://bridgedb.github.io/datasources/datasources.tsv)
 * [https://bridgedb.github.io/datasources/datasources_headers.tsv](https://bridgedb.github.io/datasources/datasources_headers.tsv)
 * [https://bridgedb.github.io/datasources/organisms.tsv](https://bridgedb.github.io/datasources/organisms.tsv)
 
+It includes interoperability layers with [identifiers.org](https://identifiers.org/) and [Bioregistry.io](https://bioregistry.io/).
+
 ## Testing
 
 There are tests for data integrity that can be run with the following commands