Set "gliner" as the library

Hello!

## Pull Request overview
- Set "gliner" as the library

## Details
This should add a "Use in GLiNER" button in the top right of the model. This makes it a bit easier for people to figure out how to actually run this model.

- Tom Aarsen

README.md

@@ -3,6 +3,7 @@ license: apache-2.0
 pipeline_tag: token-classification
 language:
 - it
+library_name: gliner
 ---
 
 ## Installation