fix url

VRANbs-API.md

@@ -1,5 +1,5 @@
 ## VRANbs API v0.2
-[<< Home](Home)  
+[<< Home](Home.md)  
 
 FarmMaps is an asynchronous architecture, the API flow keeps this in mind.
 The API expects that all data is already processed and available provided, for example through the normal FarmMaps flow (frontend).
@@ -17,7 +17,7 @@ For the currently available public FarmMaps API you can take a look at swagger:
 
 **Users can poll the task api to see if a task is completed**  
 **This can be achieved with the task execution id obtained from calling the 'ItemTask' API.**  
-[Poll task status](Polling-task-status)  
+[Poll task status](Polling-task-status.md)  
 
 **Users can query the API for child items of a cropfield to see what items it has.**
 
@@ -38,11 +38,11 @@ For the currently available public FarmMaps API you can take a look at swagger:
 * Download item data (tiff of shape)
 
 ### Steps
-[Authentication](Authentication)  
+[Authentication](Authentication.md)  
 
 ##### Optional
-[Create Cropfield](Create-Cropfield)  
-[Upload Data](Upload-Data)  
+[Create Cropfield](Create-Cropfield.md)  
+[Upload Data](Upload-Data.md)  
 
 ###### Transform shape to geotiff
 The VRANbs task only processes tiff items as input.  
@@ -286,7 +286,7 @@ Response 403 No WRITE permissions in item
 Response 404 Item not found  
 
 ##### Create taskmap
-[Create Taskmap](Create-Taskmap)
+[Create Taskmap](Create-Taskmap.md)
 
 ##### Download the data
 In case the data is available it can be downloaded with the File API.