Update page 'VRAHerbicide API'

VRAHerbicide-API.md

@@ -64,13 +64,47 @@ Response 403 No WRITE permissions in item
 Response 404 Item not found  
 
 ###### Querying predefined herbicide agents.
+A list of herbicide agents can be requested by finding the "vnd.farmmaps.package.vra.herbicide" items, taking the first item found and reading it's data field content.  
+> Request
+```javascript
+GET /api/v1/items/?it=vnd.farmmaps.package.vra.herbicide
+```
+> Response 201
+```javascript
+{
+    "code": "....",
+    "data": [
+           {
+            "name": "Liberator",
+            "SoilType": "Dalgrond",
+            "ExtraInputType": "Lutum",
+            "MinDosis": 2,
+            "MaxDosis": 3,
+            "A": 0.1428,
+            "B": 1.285714,
+            "C": 1,
+            "D": 97,
+            "E": 3,
+            "P": 1,
+            "Crop": "Zetmeelaardappelen"
+          }
+    ]
+}
+```
+
+Response 400 Tasktype not found  
+Response 401 Not authenticated  
+Response 403 No READ permissions in item  
+Response 404 Items not found  
 
 ###### Creating an application map with the VRAHerbicide task
 Execute the task with the item code of the cropfield as parameter inside {code}.  
 Use the input map code inside {itemCode}, specifying an inputCode for the input data item.  
 
 {itemCode} needs the code of the data input item passed into it.  
-An **optional** {extraItemCode} can be passed inside the 'extraInputcode' field to process herbicide from 2 inputs.
+An **optional** {extraItemCode} can be passed inside the 'extraInputcode' field to process herbicide from 2 inputs.  
+Fill in the agent field with an agent gotten from the herbicide agents query discussed above.  
+
 The resulting application map will be created as a child item of the cropfield item (this can be queried).    
 > Request
 ```javascript