Update app.md

Author: krircc

app/app.md

@@ -4,4 +4,20 @@
 
 ### 安卓App下载
 
-[Matrix-riot安卓版]()
+[Matrix-riot安卓版](https://github.com/rustlang-cn/resourses/blob/master/app/matrix-riot_82801.apk)
+
+### WebApp
+
+[Matrix-riot的WebApp版](https://riot.im/app/#/room/#rustlang-cn:matrix.org)
+
+### Desktop下载
+
+[Matrix-riot桌面版](https://riot.im/download/desktop/)
+
+### IosApp下载
+
+[Matrix-riot的IosApp版](https://itunes.apple.com/us/app/vector.im/id1083446067)
+
+### F-Droid下载
+
+[Matrix-riot的F-Droid版](https://f-droid.org/packages/im.vector.alpha/)