Added missing cron json file

cron.json

@@ -0,0 +1,56 @@
+{
+	"main": {
+		"SERVICE_NAME": "cron",
+		"DOMAIN": "null" 
+	},
+	"containers": [
+		{ 
+			"IMAGE": "registry.format.hu/cron",
+			"NAME": "cron",
+			"UPDATE": "true",
+			"MEMORY": "64M",
+			"NETWORK": "host",
+			"SCALE": "0",
+			"VOLUMES": [
+                                {
+                                "SOURCE": "/var/run/docker.sock",
+                                "DEST": "/var/run/docker.sock",
+                                "TYPE": "rw"
+                                },
+                                {
+                                "SOURCE": "/usr/bin/docker",
+                                "DEST": "/usr/bin/docker",
+                                "TYPE": "ro"
+                                },
+				{
+				"SOURCE": "/run/",
+				"DEST": "/run/",
+				"TYPE": "rw"
+				},
+				{
+				"SOURCE": "/etc/user/data/cron",
+				"DEST": "/opt/cron",
+				"TYPE": "ro"
+				},
+				{
+				"SOURCE": "/etc/user/config/services",
+				"DEST": "/services",
+				"TYPE": "ro"
+				}
+				],
+			"PORTS": [ ],
+			"READYNESS": [
+			        {"tcp": ""},
+			        {"HTTP": ""},
+				{"EXEC": "/ready.sh"}
+				],
+                        "ENVS": [ ], 
+			"EXTRA": "--privileged --restart unless-stopped",
+			"DEPEND": "null",
+			"START_ON_BOOT": "false",
+			"CMD": "null",
+			"PRE_START": "null",
+			"POST_START": "null"
+		}
+	]
+}