adding card dav and cald dav

src/interfaces/api/handlers/caldav_handler.rs

@@ -0,0 +1,23 @@
+use axum::{
+    Router,
+    routing::get,
+    http::StatusCode,
+    response::IntoResponse,
+    Json,
+};
+use std::sync::Arc;
+use serde_json::json;
+
+use crate::common::di::AppState;
+
+// Temporary placeholder implementation
+pub fn caldav_routes() -> Router<AppState> {
+    Router::new()
+        .route("/placeholder", get(placeholder_handler))
+}
+
+async fn placeholder_handler() -> impl IntoResponse {
+    (StatusCode::OK, Json(json!({
+        "message": "CalDAV functionality is not yet implemented"
+    })))
+}