add button

crates/core/src/lib.rs

@@ -1,8 +1,6 @@
 //! The components every application needs, one cargo feature each.
-//!
-//! Components land one per feature: `button`, `checkbox`, `input`, …
-//! `default-features = false` plus the features you want for a lean build;
-//! `full` (the default) for everything. Features gate whole modules and are
-//! additive only; each component adds its `#[cfg(feature = "…")] pub mod`
-//! declaration together with its file. Shared helpers promoted per the
-//! third-use rule live in the ungated `common` module once one exists.
+
+pub mod common;
+
+#[cfg(feature = "button")]
+pub mod button;