giving an example answer to payload_3 to give an hint on efficiency

Author: Benoit HOFFMAN

README.md

@@ -62,7 +62,7 @@ The payload contains 3 types of data:
 
 #### response
 
-The response should be a json as in `example_response.json`, specifying for each powerplant how much power each powerplant should deliver. The power produced by each powerplant has to be a multiple of 0.1 Mw and the sum of the power produced by all the powerplants together should equal the load. 
+The response should be a json as in `example_payloads/response3.json`, which is the expected answer for `example_payloads/payload3.json`, specifying for each powerplant how much power each powerplant should deliver. The power produced by each powerplant has to be a multiple of 0.1 Mw and the sum of the power produced by all the powerplants together should equal the load.
 
 ### Want more challenge?
 

example_payloads/response3.json

@@ -0,0 +1,26 @@
+[
+    {
+        "name": "windpark1",
+        "p": 90.0
+    },
+    {
+        "name": "windpark2",
+        "p": 21.6
+    },
+    {
+        "name": "gasfiredbig1",
+        "p": 460.0
+    },
+    {
+        "name": "gasfiredbig2",
+        "p": 338.4
+    },
+    {
+        "name": "gasfiredsomewhatsmaller",
+        "p": 0.0
+    },
+    {
+        "name": "tj1",
+        "p": 0.0
+    }
+]