Add installation instructions to LSP plugin READMEs

Each README now includes:
- Supported file extensions
- Installation commands for different platforms/package managers
- Links to project websites and documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

plugins/swift-lsp/README.md

@@ -1,8 +1,25 @@
 # swift-lsp
 
-This plugin provides LSP (Language Server Protocol) integration for Claude Code.
+Swift language server (SourceKit-LSP) for Claude Code, providing code intelligence for Swift projects.
 
-## Requirements
+## Supported Extensions
+`.swift`
 
-The corresponding language server must be installed on your system. The plugin will be recommended when you edit files with the supported extensions and have the language server binary available.
+## Installation
 
+SourceKit-LSP is included with the Swift toolchain.
+
+### macOS
+Install Xcode from the App Store, or install Swift via:
+```bash
+brew install swift
+```
+
+### Linux
+Download and install Swift from [swift.org](https://www.swift.org/download/).
+
+After installation, `sourcekit-lsp` should be available in your PATH.
+
+## More Information
+- [SourceKit-LSP GitHub](https://github.com/apple/sourcekit-lsp)
+- [Swift.org](https://www.swift.org/)