Create LICENSE.md

geocoder/namedplace/LICENSE.md

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+# License
+
+This work is licensed under a Creative Commons Attribution 3.0 License, see http://creativecommons.org/licenses/by/3.0/.
+
+## Named places geocoder
+The datasets addressed in this section and their corresponding sources are as follows:
+* global_cities_points
+  * From [Geonames. Licensed under a Creative Commons Attribution 3.0](http://creativecommons.org/licenses/by/3.0/)
+* global_cities_alternates
+  * From [Geonames. Licensed under a Creative Commons Attribution 3.0](http://creativecommons.org/licenses/by/3.0/)