Create README.md

Creation of the README.md file with the description of the component, what it is for, how to use it, and an example

Author: isaac-vicentini

Modern Development/Service Portal Widgets/Language Selector/README.md

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+# Language Selector with Flags
+
+A language selector widget for the Portal.  
+The user can change the instance language without having to leave the Portal.
+
+<img width="255" height="95" alt="image" src="https://github.com/user-attachments/assets/af130ec4-d724-4b07-a38f-afd858b7eba2" />
+<img width="234" height="195" alt="image" src="https://github.com/user-attachments/assets/a2de8161-a922-4376-904d-b16f81dcc573" />
+
+
+## What it does
+- Displays a dropdown with flags and language names.
+- Automatically updates the user's language in the `sys_user` table.
+- Reloads the page to apply the new language immediately.
+
+## Files
+- **HTML Template:** renders the dropdown with flag emojis and labels.  
+- **Client Script:** handles language selection and sends the PATCH request.  
+- **Server Script:** provides the current user ID and stored language.  
+
+## Example
+When the user selects **🇪🇸 Spanish**, the widget updates their user record and reloads the Portal in Spanish.
+
+## Prerequisites
+- The language selected **must be installed and active** in the instance.