Add recommended sauna related fields from 'leisure=sauna' Wikipage to sauna type

data/fields/gender_segregated.json

@@ -0,0 +1,5 @@
+{
+    "key": "gender_segregated",
+    "type": "check",
+    "label": "Gender separated areas or timeslots"
+}

data/fields/sauna.json

@@ -0,0 +1,16 @@
+{
+    "key": "sauna",
+    "type": "combo",
+    "label": "Sauna type",
+    "strings": {
+        "options": {
+            "hot": "Finnish Sauna over > 60°C",
+            "steam": "Steam Sauna",
+            "smoke": "Smoke Sauna",
+            "dry": "Sauna without throwing water",
+            "infrared": "Infrared Sauna",
+            "aroma": "Aroma Sauna",
+            "hanjeungmak": "Hanjeungmak (Korean Dry Sauna)"
+        }
+    }
+}

data/fields/sauna_fuel.json

@@ -0,0 +1,13 @@
+{
+    "key": "sauna:fuel",
+    "type": "combo",
+    "label": "Sauna fuel",
+    "strings": {
+        "options": {
+            "electricity": "Electricity",
+            "gas": "Natural Gas",
+            "wood": "Wood",
+            "oil": "Fuel Oil"
+        }
+    }
+}

data/fields/sauna_heating.json

@@ -0,0 +1,11 @@
+{
+    "key": "sauna:heating",
+    "type": "combo",
+    "label": "Sauna heating method",
+    "strings": {
+        "options": {
+            "once": "Heated once before using",
+            "continuous": "Heating is continued during usage"
+        }
+    }
+}

data/fields/sauna_water.json

@@ -0,0 +1,5 @@
+{
+    "key": "sauna:water",
+    "type": "check",
+    "label": "Throwing water on the sauna stove"
+}

data/presets/leisure/sauna.json

@@ -8,7 +8,14 @@
         "access_simple",
         "fee",
         "payment_multi_fee",
-        "charge_fee"
+        "charge_fee",
+        "reservation",
+        "gender",
+        "gender_segregated",
+        "sauna",
+        "sauna_fuel",
+        "sauna_heating",
+        "sauna_water"
     ],
     "moreFields": [
         "{@templates/contact}",