[add] example:sweets

doc/examples/sweets.sindri.json

@@ -0,0 +1,13 @@
+{
+	"domains": [
+		{
+			"name": "sweets",
+			"description": "collection of sweets",
+			"key_field": {"name": "id"},
+			"data_fields": [
+				{"name": "name", "type": "string_medium"},
+				{"name": "calories", "type": "integer"}
+			]
+		}
+	]
+}