docs(README.md): Add key features and usage section

Author: flovogt

README.md

@@ -17,13 +17,23 @@
 	- [Code of Conduct](#code-of-conduct)
 	- [Licensing](#licensing)
 
-## Features
+## Key Features
 
-To be filled
+- Helps with the creation of new UI5 projects when working with Claude Code
+- Supports the developer to detect and fix UI5-specific errors
+- Provides additional UI5-specific information for Claude Code
 
-## Usage
+## Installation
 
-To be filled
+Via Claude CLI:
+```bash
+claude plugin install ui5@claude-plugins-official
+```
+
+In Claude Code:
+```
+/plugin install ui5@claude-plugins-official
+```
 
 ## Further Information