adding antiquities act

antiquities-act/README.md

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+### Actions under the Antiquities Act 
+
+Data behind the story [TKTK](http://fivethirtyeight.com/features/tktk/). This data was compiled by the National Parks Conservation Association and includes national monuments that were created by presidents by under the Antiquities Act. It does not include national monuments created by Congress. 
+
+Header | Definition
+---|---------
+`current_name` | Current name of piece of land designated under the Antiquities Act
+`states` | State(s) or territory where land is located
+`original_name` | If included, original name of piece of land designated under the Antiquities Act
+`current_agency` | Current land management agency. NPS = National Parks Service, BLM = Bureau of Land Management, USFS = US Forest Service, FWS = US Fish and Wildlife Service, NOAA = National Oceanic and National Oceanic and Atmospheric Administration 
+`action` | Type of action taken on land 
+`date` | Date of action
+`year` | Year of action
+`pres_or_congress` | President or congress that issued action
+`acres_affected` | Acres affected by action. Note that total current acreage is not included. National monuments that cover ocean are listed in square miles.
+
+Sources: [National Parks Conservation Association](https://www.npca.org/) and [National Parks Service Archeology Progam](https://www.nps.gov/history/archeology/sites/antiquities/MonumentsList.htm)