Update README.md

Author: XiaoPangxie732

README.md

@@ -6,7 +6,7 @@ Usage is in [Wiki](https://github.com/XiaoPangxie732/MojangAPI-in-Java/wiki)
 
 ## Download
 Maven:
-Follow [here]() to add repository first.
+Follow [these steps](https://help.github.com/cn/github/managing-packages-with-github-packages/configuring-apache-maven-for-use-with-github-packages#installing-a-package) to add repository first.
 ```xml
 <dependency>
   <groupId>cn.xiaopangxie732</groupId>