Update README.md completed

README.md

@@ -10,3 +10,19 @@ CoderKit is an Xcode Source Editor Extension that provides GitHub Copilot and Co
 - Xcode color theme sync to autocompletion panel.
 - More features coming soon.
 
+## Prerequisites
+
+- Internet connection.
+
+- Either a GitHub Copilot account or Codeium account:
+  - [Node](https://nodejs.org/) need to be installed if using Github Copilot.
+
+## Installation and Setup
+
+> 1. Install the app into the Applications folder and run it to set up.
+> 2. As promoted, enable the source editor extension in MacOS system settings -> Privacy & Security -> Extensions -> Xcode Source Editor.
+> 3. Grant Accessibility API permission to the CoderKit extension app in MacOS system settings -> Privacy & Security -> Accessibility .
+> 4. In General tab, select Codeium or GitHub Copilot as your service provider.
+> 5. Accordingly, click Codeium or GitHub Copilot tab to follow the screen to set up.
+
+