fix: typo

Author: TzuHuanTai

README.md

@@ -59,7 +59,7 @@ Use [Raspberry Pi Imager](https://www.raspberrypi.com/software/) to flash **Lite
 
 ```bash
 sudo apt update
-sudo apt isnstall libcamera0.5 libmosquitto1 pulseaudio libavformat59 libswscale6 libprotobuf32
+sudo apt install libcamera0.5 libmosquitto1 pulseaudio libavformat59 libswscale6 libprotobuf32
 ```
 
 ### 3. Download App