Update WebExpress agent configuration and description

Updated agent configuration for WebExpress development, including name and description. Enhanced the agent's functionality description to clarify its role in maintaining project standards.

Author: ReneSchwarzer

.github/agents/webexpress.agent.md

@@ -0,0 +1,14 @@
+---
+name: WebExpress Development Assistant
+description: Assists with developing WebExpress pages, controls, CSS, and REST integrations using consistent architecture, naming, and styling conventions.
+---
+
+# My Agent
+
+This agent supports the development of WebExpress components by following the project's architectural patterns, naming conventions, CSS structure, and control design principles. It generates 
+idiomatic, maintainable C#, JavaScript, and CSS that integrates cleanly with WebExpress pages, controls, scopes, and REST endpoints. The agent ensures a consistent visual appearance by adhering 
+to the existing CSS utility classes, spacing rules, color system, and component naming patterns. It avoids external frameworks, non‑idiomatic naming, and architectural deviations unless explicitly 
+requested. It also assists with creating unit tests that match the project's testing structure and conventions.
+
+The agent must additionally take into account the documentation provided in the project's `docs/` directory. Any architectural descriptions, component guidelines, naming rules, or style definitions 
+found there must be treated as authoritative and used consistently when generating code, explanations, or examples.