Update README.md

README.md

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-# ez-presence
+# Sigma Presence
 Custom Discord RPC with modern interface :3 (sorry i had no idea for name)
+
+### How do I use Sigma Presence?
+You can Install the .exe and run the setup file after doing so you launch the exe file and put your Client ID in and fill the blanks and click on  Start RPC
+
+### What if I am not using Windows?
+You can download **Sigma Presence** source code and either compile the source code using the electron-build package by running the command "electron-build --linux" or "electron build --mac" or you can run the development build by running npm start.