docs: update README

Author: fiftin

README.md

@@ -1,3 +1,13 @@
 # External Monitor Switcher
 
-Switching to the external monitor when lid closed.
+Switching to the external monitor when laptop lid closed.
+
+This small app is useful if you have a laptop with an external monitor and keyboard. And from time to time you close your laptop and only want to use an external monitor.
+
+This app automatically disables the laptop monitor when you close the lid.
+
+# How to use
+
+1. Download latest release of the app from [Releses page](https://github.com/ansible-semaphore/semaphore/releases/).
+2. Store it to `C:\utils` or other folder which you use for portable apps.
+3. Press `Win+R` and execute command `Shell:common startup`. Create link to the app in opened folder (Stratup programs).