Rename to README to render directly

README.md

@@ -1,6 +1,6 @@
 # ethology-test-data
 
-Test data for the [ethology](https://github.com/neuroinformatics-unit/ethology) Python package. For a description of the available test data, see [DATA_DESCRIPTION](test_data/DATA_DESCRIPTION.md).
+Test data for the [ethology](https://github.com/neuroinformatics-unit/ethology) Python package. For a description of the available test data, see the [description of available data](test_data/README.md).
 
 ## Adding or editing data