Add Tetherball Court preset (#441)

data/presets/leisure/pitch/tetherball.json

@@ -0,0 +1,24 @@
+{
+    "icon": "maki-pitch",
+    "fields": [
+        "{leisure/pitch}",
+        "access_simple"
+    ],
+    "geometry": [
+        "area",
+        "point"
+    ],
+    "tags": {
+        "leisure": "pitch",
+        "sport": "tetherball"
+    },
+    "reference": {
+        "key": "sport",
+        "value": "tetherball"
+    },
+    "terms": [
+        "tether tennis",
+        "swingball"
+    ],
+    "name": "Tetherball Court"
+}