Update README.md

README.md

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 # LogitechCraftBacklightSwitcher
-Easy back-light switcher for Logitech Craft Keyboard
+Easy back-light switcher for Logitech Craft Keyboard.
+
+LogitechOptions must be installed in your system.
+
+This program just toggle backlight checkbox in LogitechOptions. For it using [White Framework](https://github.com/TestStack/White) - C# UI Automation Framework.
+
+**Command line:**
+- On - turn on backlight
+- Off - turn off backlight
+- <empty> - toggle backlight
+
+
+**settings.ini**
+- LogiOptionsUiExe = %ProgramData%\Logishrd\LogiOptions\Software\Current\LogiOptionsUI.exe
+- LogiOptionsUiArguments = devid:6b350
+- CheckBoxAutomationId = BacklightingCheckBox
+- MainWindowName = Logitech Options
+- Timeout = 10000
+