add Installation instructions

README.md

@@ -7,6 +7,7 @@
 * [Features](#features)
 * [Known issues](#known-issues)
 * [Download](#download)
+* [Installation](#installation)
 * [Support the developers!](#support-the-developers)
 * [FAQ](#faq)
 * [Building (optional)](#building-optional)
@@ -94,6 +95,9 @@
 
 </details>
 
+# Installation
+See [Installation - Wiki](https://github.com/qnblackcat/uYouPlus/wiki/Installation)
+
 # Support the developers
 
 <details>