Update README.md

Author: nxshell

README.md

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 # nxshell-app
 SSH terminal Android/iOS app base on Flutter xterm.
 
+<div align="center">
+  <div style="display: flex;justify-content: space-between;">
+    <img src="https://raw.githubusercontent.com/nxshell/nxshell-mobile/main/terminal-cmd.jpg" width="45%"/>
+    <img src="https://raw.githubusercontent.com/nxshell/nxshell-mobile/main/terminal.jpg" width="45%"/>
+  </div>
+</div>
+
 # nxshell-desktop
 An easy to use [new terminal](https://github.com/nxshell/nxshell) for Windows/Linux/MacOS platform. It like Xshell or SecureCRT or PuTTY shell client.