Add 'Shape-to-geotiff.md'

Shape-to-geotiff.md

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+The VRAHerbicide task only processes tiff items as input.  
+If your input data is a processed shape file it first needs to be converted to geotiff, this can be done with the 'ShapeToGeoTiffTask'.  
+
+Pass the code of the shape item into the {code} parameter, this creates a new item with tiff data as a sibling of the shape item with the same parent 
+This new geotiff item should be used as input to the a task.
+
+> Request
+```javascript
+POST /api/v1/items/{code}/tasks
+{
+  "taskType": "vnd.farmmaps.task.shapetogeotiff"
+}
+```  
+> Response 201
+```javascript
+{
+  "code": "string",
+  "taskType": "vnd.farmmaps.task.shapetogeotiff"
+}
+```
+
+Response 400 Tasktype not found  
+Response 401 Not authenticated  
+Response 403 No WRITE permissions in item  
+Response 404 Item not found