doc update

README.md

@@ -14,6 +14,82 @@ You will need python 2.7 and python-shapely rpm packages
 
 ## Usage example
 
+Run with
+
+```python
+    python exercisemodel/
+```
+or if zipped
+
+```python
+    python exercisemodel.zip
+```
+
+Needs a input.json as input which has one feature which would usually start the PADM model. startDate and stopDate is used from this. Also it requres another feature which is a geometry LineString and specifies the trajectory for the model to follow. 
+
+Example:
+
+
+```javascript
+{
+	"type": "FeatureCollection",
+	"features": [{
+		"type": "Feature",
+		"properties": {
+			"simulation": {
+				"forwardCalculation": true,
+				"startDate": 1512572400000,
+				"stopDate": 1512576000000,
+				"oilclass": "Oil classes",
+				"substance": "Medium oils (100-1000 cSt)",
+				"fresh": true,
+				"amount": "10",
+				"amountUnit": "m3",
+				"uncertainty": false,
+				"mode": "Normal"
+			},
+			"primary": "PADM",
+			"type": "oil",
+			"subtype": "instant",
+			"meanLat": 58.950008233357046,
+			"meanLng": 20.302734375000004,
+			"observation": [{
+				"id": null,
+				"provider": "USER",
+				"providerDataRef": null,
+				"providerImgRef": null,
+				"providerType": null,
+				"type": "MANUAL",
+				"date": 1512572400000
+			}],
+			"domain": "HELCOM",
+			"model": "NEMO"
+		},
+		"geometry": {
+			"type": "Point",
+			"coordinates": [20.302734375000004, 58.950008233357046]
+		}
+	}, {
+		"type": "Feature",
+		"properties": {
+			"auxiliary": "exercise",
+			"time": [1512573300000, 1512574200000, 1512575100000, 1512576000000]
+		},
+		"geometry": {
+			"type": "LineString",
+			"coordinates": [
+				[20.566406250000004, 58.81374171570782],
+				[20.742187500000004, 58.69977573144006],
+				[20.961914062500004, 58.60833366077633],
+				[21.181640625000004, 58.51665179936381]
+			]
+		}
+	}]
+}
+```
+
+Will generate typical PADM outout files like particletrack.dat files, cloudtrack.dat files, exercise.log and can optionally write output.json
+
 ### Options
 
 ## Copyright and License