docs: added banners and icons (#443)

* added banners and icons

* fix: formatting

plugins/sql/src/lib.rs

@@ -2,6 +2,15 @@
 // SPDX-License-Identifier: Apache-2.0
 // SPDX-License-Identifier: MIT
 
+//! [![](https://github.com/tauri-apps/plugins-workspace/raw/v2/plugins/sql/banner.png)](https://github.com/tauri-apps/plugins-workspace/tree/v2/plugins/sql)
+//!
+//! Interface with SQL databases through [sqlx](https://github.com/launchbadge/sqlx). It supports the `sqlite`, `mysql` and `postgres` drivers, enabled by a Cargo feature.
+
+#![doc(
+    html_logo_url = "https://github.com/tauri-apps/tauri/raw/dev/app-icon.png",
+    html_favicon_url = "https://github.com/tauri-apps/tauri/raw/dev/app-icon.png"
+)]
+
 #[cfg(any(
     all(feature = "sqlite", feature = "mysql"),
     all(feature = "sqlite", feature = "postgres"),