Add optional station_parking rule to geofencing_zones.json (#349)

Merging - will fix key words issue discussed above in separate PR

gbfs.md

@@ -1081,6 +1081,7 @@ Field Name | REQUIRED | Type | Defines
 &emsp;&emsp;&emsp;\-&nbsp;`ride_allowed` | Conditionally REQUIRED | Boolean | REQUIRED if `rules` array is defined. Is the undocked (“free floating”) ride allowed to start and end in this zone? <br /><br /> `true` - Undocked (“free floating”) ride can start and end in this zone. <br /> `false` - Undocked (“free floating”) ride cannot start and end in this zone.
 &emsp;&emsp;&emsp;\-&nbsp;`ride_through_allowed` | Conditionally REQUIRED | Boolean | REQUIRED if `rules` array is defined. Is the ride allowed to travel through this zone? <br /><br /> `true` - Ride can travel through this zone. <br /> `false` - Ride cannot travel through this zone.
 &emsp;&emsp;&emsp;\-&nbsp;`maximum_speed_kph` | OPTIONAL | Non-negative Integer | What is the maximum speed allowed, in kilometers per hour? <br /><br /> If there is no maximum speed to observe, this can be omitted.
+&emsp;&emsp;&emsp;\-&nbsp;`station_parking` | OPTIONAL | Boolean | Vehicle MUST be parked at stations defined in station_information.json within this geofence zone? <br /><br />`true` - MUST only be parked at stations.  <br /> `false` - MAY be parked outside of stations.
 
 ##### Example:
 
@@ -1160,7 +1161,8 @@ Field Name | REQUIRED | Type | Defines
                 ],
                 "ride_allowed": false,
                 "ride_through_allowed": true,
-                "maximum_speed_kph": 10
+                "maximum_speed_kph": 10,
+                "station_parking": true
               }
             ]
           }