Create preset for residential garden (#714)

There's a preset for community garden, but none for residential garden, which was very confusing for me. Adding one with some synonyms I found at Wikipedia.

Co-authored-by: Martin Raifer <martin@raifer.tech>:

only allow on areas: as this is extremely uncommon: currently only 100 out of 100k features with this tag are nodes: https://taginfo.openstreetmap.org/tags/garden%3Atype=residential

data/presets/leisure/garden/residential.json

@@ -0,0 +1,21 @@
+{
+    "icon": "maki-garden",
+    "geometry": [
+        "area"
+    ],
+    "tags": {
+        "leisure": "garden",
+        "garden:type": "residential"
+    },
+    "reference": {
+        "key": "garden:type"
+    },
+    "terms": [
+        "back garden",
+        "backyard",
+        "domestic garden",
+        "front garden",
+        "front yard"
+    ],
+    "name": "Residential Garden"
+}