Add Diving Platform preset (#637)

Author: arch0345

data/fields/tower/platforms.json

@@ -0,0 +1,7 @@
+{
+    "key": "tower:platforms",
+    "type": "number",
+    "minValue": 1,
+    "label": "Platforms",
+    "placeholder": "1, 2, 3..."
+}

data/presets/man_made/tower/diving.json

@@ -0,0 +1,23 @@
+{
+    "icon": "temaki-diving",
+    "geometry": [
+        "point",
+        "area"
+    ],
+    "fields": [
+        "{man_made/tower}",
+        "tower/platforms"
+    ],
+    "tags": {
+        "man_made": "tower",
+        "tower:type": "diving"
+    },
+    "reference": {
+        "key": "tower:type",
+        "value": "diving"
+    },
+    "terms": [
+        "diving tower"
+    ],
+    "name": "Diving Platform"
+}