feat: add a maximum order quantity

.eslintrc.js

@@ -0,0 +1,14 @@
+module.exports = {
+    "env": {
+        "browser": true,
+        "jquery": true,
+        "es6": true
+    },
+    "extends": "eslint:recommended",
+    "parserOptions": {
+        "ecmaVersion": 6
+    },
+    "rules": {
+      "no-unused-vars": ["error", { "vars": "local" }]
+    }
+}