feat：下单接口

 {
   "name": "jiaoyin/common",
   "description": "indigo common php lib by jy",
-  "require": {},
+  "require": {
+    "ext-json": "*"
+  },
   "autoload": {
     "psr-4": {
       "Jiaoyin\\": "./src/"

@@ -182,6 +182,12 @@ class BinanceSpot
         $method = 'PUT';
         return $this->requestListenKey($method, $path, $param);
     }
+    public function  order($param)
+    {
+        $path = '/api/v3/order/test';
+        $method = 'POST';
+        return $this->requestListenKey($method, $path, $param);
+    }
 
     /*
      * ==================================