Added croppinscheme step

Create-Croppingscheme.md

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+## Create croppingscheme with the farmmaps API
+* Create a 'vnd.farmmaps.itemtype.croppingscheme' item as a child of the 'USER_IN' item.  
+The data property can be used to add some information about the farm and the geometry can be used as location of the farm. 
+ 
+> Request
+```javascript
+POST /api/v1/items
+{
+    "parentCode": "{USER_IN_item_code}",
+    "itemType": "vnd.farmmaps.itemtype.croppingscheme",
+    "name": "Name for the scheme",
+    "data": {},
+    "geometry": {"type":"Polygon","coordinates":[[[6.09942873984307,53.070025028087],[6.09992507404607,53.0705617890585],[6.10036959220086,53.0710679529031],[6.10065149010421,53.0714062774307],[6.10087493644271,53.0716712354474],[6.10091082982487,53.0716936039203],[6.10165087441291,53.0712041549161],[6.10204994718318,53.0709349338005],[6.10263143118855,53.0705789370018],[6.10311578125011,53.0702657538294],[6.10331686552072,53.0701314102389],[6.103326530575,53.070119463569],[6.10309137950343,53.0699829669055],[6.10184241586523,53.0692902201371],[6.10168497998891,53.0691984306747],[6.10092987659869,53.0694894453514],[6.09942873984307,53.070025028087]]]}
+}
+```  
+> Response 201 Created
+```Javascript
+{
+  "parentCode": "string",
+  "geometry": {},
+  "data": {},
+  "tags": [
+    "string"
+  ],
+  "url": "string",
+  "code": "string",
+  "name": "string",
+  "created": "2019-12-18T10:16:21.455Z",
+  "updated": "2019-12-18T10:16:21.455Z",
+  "dataDate": "2019-12-18T10:16:21.455Z",
+  "itemType": "string",
+  "sourceTask": "string",
+  "size": 0,
+  "state": 0,
+  "thumbnail": true
+}
+```