Update toolbox README.md with all available tools

Replace Features section with comprehensive Available Tools list including
all 8 third-party tools now in the toolbox package:

- Brave Search: Web search functionality
- Firecrawl: Website scraping, crawling, and URL mapping
- Mapbox: Geocoding and reverse geocoding services
- OpenMeteo: Weather data and forecasting services
- SerpApi: Internet search functionality
- Tavily: Web search and content extraction
- Wikipedia: Search and retrieve articles
- YouTube Transcriber: Fetch video transcripts

Also update Requirements section to list API keys needed for each tool
and note which tools are free to use.

Author: OskarStark

src/toolbox/README.md

@@ -2,10 +2,16 @@
 
 A collection of third-party tools for Symfony AI agents.
 
-## Features
+## Available Tools
 
 - **Brave Search**: Web search functionality using the Brave Search API
+- **Firecrawl**: Website scraping, crawling, and URL mapping capabilities
+- **Mapbox**: Geocoding and reverse geocoding services
+- **OpenMeteo**: Weather data and forecasting services
+- **SerpApi**: Internet search functionality via SerpApi
+- **Tavily**: Web search and content extraction services
 - **Wikipedia**: Search and retrieve Wikipedia articles
+- **YouTube Transcriber**: Fetch transcripts from YouTube videos
 
 ## Installation
 
@@ -47,7 +53,16 @@ $article = $wikipedia->article('Artificial intelligence');
 
 - PHP 8.2 or higher
 - Symfony HTTP Client
-- Brave Search API key (for Brave tool)
+- API keys for specific tools:
+  - Brave Search API key (for Brave tool)
+  - Firecrawl API key and endpoint (for Firecrawl tool)
+  - Mapbox access token (for Mapbox tool)
+  - SerpApi key (for SerpApi tool)
+  - Tavily API key (for Tavily tool)
+- Optional dependencies:
+  - `mrmysql/youtube-transcript` package (for YouTube Transcriber tool)
+
+**Note**: OpenMeteo and Wikipedia tools require no API keys.
 
 ## Testing