Create LICENSE.md

geocoder/admin1/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/
+
+# Additional attributions for source data
+This project contains data from Open Data portals, government or other sources. The copyright and/or licenses of the datasets mentioned throughout this project are as follows:
+
+## Administrative regions level 1 geocoder
+The datasets addressed in this section and their corresponding sources are as follows:
+* global_province_polygons
+  * From [Natural Earth Data. Public Domain license.](http://www.naturalearthdata.com/about/terms-of-use/)
+* admin1_synonyms