Update README.md

Author: yanglbme

solution/0700-0799/0729.My Calendar I/README.md

@@ -256,6 +256,36 @@ impl MyCalendar {
 }
 ```
 
+#### JavaScript
+
+```js
+var MyCalendar = function () {
+    this.calendar = [];
+};
+
+/**
+ * @param {number} start
+ * @param {number} end
+ * @return {boolean}
+ */
+MyCalendar.prototype.book = function (start, end) {
+    for (const item of this.calendar) {
+        if (end <= item[0] || item[1] <= start) {
+            continue;
+        }
+        return false;
+    }
+    this.calendar.push([start, end]);
+    return true;
+};
+
+/**
+ * Your MyCalendar object will be instantiated and called as such:
+ * var obj = new MyCalendar()
+ * var param_1 = obj.book(start,end)
+ */
+```
+
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