Add ZONES_FT

Fixes #4

README.md

@@ -76,6 +76,7 @@ Filename 					| Description
 [`fare_rules.txt`](/files/fare_rules.md)							| fare rules  
 [`fare_rules_ft.txt`](/files/fare_rules_ft.md)						| additional fare rules  
 [`fare_transfer_rules_ft.txt`](/files/fare_transfer_rules_ft.md)	| fare transfer rules  
+[`zones_ft.txt`](/files/zones_ft.md)	                            | zone locations 
 
 # Fares
 

files/zones_ft.md

@@ -0,0 +1,21 @@
+## Zones information
+
+ *  Filename MUST be `zones_ft.txt`
+ *  File MUST contain a record for every analysis zone.
+ *  File MUST be a valid CSV file.
+ *  The first line of each file MUST contain case-sensitive field names.
+ *  Field names MUST NOT contain tabs, carriage returns or new lines.
+
+File MUST contain the following attributes:
+
+Required Attributes	| Description										
+----------			| -------------		
+`zone_id`			| ID that uniquely identifies a zone
+`zone_lat`          | Float.  Latitude of zonal centroid or point representing the zone.
+`zone_long`         | Float.  Longitude of zonal centroid or point representing the zone.
+
+File MAY contain the following attributes:
+
+Optional Attributes		| Description										
+----------				| -------------		
+`zone_name`			    | Optional name for identification and display purposes.