Add radar to Readme

README.md

@@ -1,11 +1,12 @@
 # Python3 ÖBB API
 
 This project aims to provide a functional API for the Austrian Federal Railways
-(Österreichische Bundesbahnen, ÖBB). It has three core features/request types:
+(Österreichische Bundesbahnen, ÖBB). It has four core features/request types:
 
 * Search for Public Transportation stops by name ("val")
 * Search for Public Transportation stops by coordinates ("nearby")
 * Search for Public Transportation connections between two stops ("conn")
+* Search for the current location of a train ("radar")
 
 ## Request
 
@@ -122,6 +123,23 @@ appearance in the request.
 (https://bahnapi.xyz/?type=conn&from=Bruck an der Mur&to=Salzburg&via=Leoben
 &via=Selzthal&via=Linz)
 
+### Search for current location of trains ("radar")
+
+The following parameter is required for this type of request:
+
+* "type": "radar"
+
+The following optional parameter is accepted:
+
+* "train": Train number (including prefix)
+
+If "train" is not set, this will return the location and destination of all
+trains currently running. If "train" is set, only trains matching the passed
+train numbers are returned. Multiple "train" parameters may be passed in a
+single request.
+
+* [Example "radar" request](https://bahnapi.xyz/?type=radar&train=s9)
+
 ### Short requests
 
 For "val" and "conn" requests, it is possible to use shorter requests by passing