#16: switch to EUPL 1.2 license + DCO (#224)

Author: reinkrul

DCO.md

@@ -0,0 +1,14 @@
+Developer Certificate of Origin
+Version 1.1
+
+By making a contribution to the Nuts Knooppunt project, I certify that:
+(a) The contribution was created in whole or in part by me and I
+have the right to submit it under the EUPL v1.2 license; or
+(b) The contribution is based upon previous work that is covered by
+an appropriate open source license and I have the right to submit
+that work with modifications under the EUPL v1.2 license; or
+(c) The contribution was provided directly to me by some other
+person who certified (a), (b) or (c) and I have not modified it.
+(d) I understand and agree that this project and the contribution
+are public and that a record of the contribution is maintained
+indefinitely and may be redistributed under the EUPL v1.2.