update skills documentation

Author: ArslanSaleem

docs/v3/skills.mdx

@@ -5,6 +5,10 @@ description: "Learn how to create and use custom skills to extend PandasAI's cap
 
 Skills allow you to add custom functions that the agent can use, expanding its capabilities beyond standard data analysis. These custom functions are automatically registered and available to the agent, enabling a wide range of user-defined operations.
 
+:::info Enterprise Feature
+Skills are part of PandasAI Enterprise and require a valid enterprise license for production use. For development and testing purposes, you can use skills without a subscription. See the [Enterprise License](https://github.com/gventuri/pandas-ai/blob/main/pandasai/ee/LICENSE) for full terms and conditions.
+:::
+
 ## Key Features
 
 - **Automatic Registration**: Skills are automatically registered when decorated with `@skill`