Update project metadata (readme, licence, setup.py, etc)

LICENSE

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README.md

@@ -3,3 +3,13 @@ Sample data for use with the ESMValTool
 
 This repository will contain samples of real data for use with the ESMValTool for demonstration purposes and automated testing.
 The goal is to keep the repository size small (~ 100 MB), so it can be easily downloaded.
+
+Licence
+-------
+
+This work is dual-licensed under Apache 2.0 and CC-BY-SA 4.0.
+The data (`esmvaltool_sample_data/data/`) are derived from CMIP6,
+and licenced under CC-BY-SA 4.0. The rest of the contents of this work, if
+not specified otherwise, is licenced under Apache 2.0. The terms of the
+Apache 2.0 licence are available in the LICENCE file, and the terms of the
+CC-BY-SA 4.0 licence in the `esmvaltool_sample_data/data/LICENCE` file.