list of possible values for _category key

Author: freyfogle

category_values.md

@@ -0,0 +1,22 @@
+List of possible `_category` values in the `components` portion of a geocoding result. Please see [the OpenCage Geocoder API docs](https://opencagedata.com/api#formatted) for details.
+
+  * agriculture
+  * building
+  * commerce
+  * construction
+  * education
+  * financial
+  * government
+  * health
+  * industrial
+  * military
+  * natural/water
+  * outdoors/recreation
+  * place
+  * place_of_worship
+  * postcode
+  * road
+  * social
+  * transportation
+  * travel/tourism
+  * unknown