Add ProfileGeneratorTool and CollectionToolResult examples in documentation

- Updated `README.md` with `ProfileGeneratorTool` registration.
- Extended `building_tools.md` to document `CollectionToolResult` usage with examples.

Author: klapaudius

README.md

@@ -72,6 +72,7 @@ Key benefits:
                 ttl: 100
         tools:
             - KLP\KlpMcpServer\Services\ToolService\Examples\HelloWorldTool
+            - KLP\KlpMcpServer\Services\ToolService\Examples\ProfileGeneratorTool
             - KLP\KlpMcpServer\Services\ToolService\Examples\StreamingDataTool
             - KLP\KlpMcpServer\Services\ToolService\Examples\VersionCheckTool
         resources:

docs/building_tools.md

@@ -309,6 +309,19 @@ For referencing external resources:
 return new ResourceToolResult($resourceUri, 'application/json');
 ```
 
+#### CollectionToolResult
+For combining multiple tool results into a single response:
+
+```php
+$collection = new CollectionToolResult;
+$collection->addItem(new TextToolResult("Operation completed successfully"));
+$collection->addItem(new ImageToolResult($imageData, 'image/png'));
+
+return $collection;
+```
+
+You can add any type of ToolResultInterface object to a CollectionToolResult, except another CollectionToolResult (nesting is not supported).
+
 ## Testing Your MCP Tools
 
 ### Using the Test Command