add stracchino recipe

recipes.json

@@ -15,6 +15,23 @@
         "onexit": "#t"
       }
     ]
+},
+    {
+    "name": "Stracchino",
+    "description": "Tiene lo stracchino a ~35 gradi per 24 ore",
+    "controllers": [
+      "(make-duty-controller \"heater\" 0.20 120)"
+    ],
+    "phases": [
+      {
+        "name": "Hold",
+        "text": "Keep 35\u00b0C",
+        "nextcond": "(> (time-in-this-phase) (hours 24))",
+        "current": false,
+        "onload": "(begin (set-controller \"heater\" \"T_food\")\n(set-target \"T_food\" 35.0))",
+        "onexit": "#t"
+      }
+    ]
 },
   {
     "name": "Yogurt",