Update 'README.md'

README.md

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 # RX_API_Call
 
-Create a very basic API using tools and languages of your choice. The API will have a single endpoint/method
-with a single function.
+## Objective
+Create a very basic API using tools and languages of your choice. The API will have a single endpoint/method
+with a single function.
+### API Input
+1. User Location - The API will receive a latitude and longitude value which describes the current location of a
+user.
+### API Output
+1. The API will return a simple response packet with the name and address of the pharmacy chosen by the
+application.
+2. The distance between: the input latitude/longitude and the location of the pharmacy.
+### Business Requirements
+1. The API will receive a latitude/longitude, using the provided list in pharmacies.csv the API will calculate the
+closest pharmacy to the input latitude/longitude.
+2. The API will return the closest pharmacy (with name and address) in a consumable response packet. 3. The
+API will include the distance (in miles) between the input latitude/longitude and the selected closest pharmacy
+in the response packet.