feat: add editor component

crates/editor/src/lib.rs

@@ -0,0 +1,8 @@
+//! Read-only code surfaces for gpui applications: tree-sitter highlighted
+//! code views, one cargo feature per language grammar. A language whose
+//! grammar feature is off renders as plain text.
+
+#[cfg(feature = "code_view")]
+pub mod code_view;
+
+pub mod highlight;