Updated the readme with GDPR information.

README.md

@@ -12,6 +12,7 @@ Currently, we have not yet decided if the backend should also supply routes for
 
 Other notes:
 - Dataman.se for topological data of sweden borders
+- We will have to investigate how we handle GDPR requirements
 
 # D3 mapping concepts
 The 3 concepts that are key to understanding map creation using D3 are: