Create README.md

Author: jhx0

README.md

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+# NonStop
+**NonStop** allows one to deactivate/hide the possibility of shutting down (or sleeping) a **Windows** system.   
+
+## Screenshot
+![NonStop](https://user-images.githubusercontent.com/37046652/226178897-9b22a6fc-3996-4813-8ea0-d90bf7140c8a.png)
+
+## Building
+1. Get the source (Cloning/Downloading)
+2. Open the **NonStop.sln** with Visual Studio for example
+3. Build the project
+4. There should now be a **NonStop.exe** which you can run
+
+## Notes
+The program was tested on **Windows 10 x64**.   
+
+## How does it work?
+**NonStop** alters registry values in the background so that shutting down/sleeping is not possible anymore on the given machine.   
+(Look at **src/NonStopTool.cs** to see the mentioned registry keys)
+
+## Limitations
+The program cannot currently stop a user from shutting down a system via **PowerShell**/**CMD** which is not easily possible.
+
+## Hacking
+Ideas and suggestions are welcome in general.   
+If you like to submit a patch make sure to format your code accordingly.