Update index.md

Author: emanuelecavalleri

guides/index.md

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 ## Guides
+
+SchemaLink is an open-source project that can be used and modified for non-commercial purposes under its [AGPL license](https://github.com/AnacletoLAB/schemalink-webapp/blob/main/LICENSE).  
+We provide two guides to assist our users:  
+
+- **Developer Guide**: A resource for developers to add or update SchemaLink features.  
+- **User Guide**: A step-by-step guide for end users.