chore: update metadata and doc

- update cargo metadata for future submit
- update document

README.md

@@ -4,8 +4,8 @@ Sarasas Chip Workshop Oh My Rust FFI (abbr. SarasaCW OMRF) is a toolset includin
 
 - A Rust crate providing various facilities for C-friendly FFI.
 - A Python written tool for creating distribution and generating CMake and pkg-config files.
-- A document instructs how to write header files manually (actually performed as AI prompt and let AI do it).
-- A document instructs how to map Rust specific struct like `Option`, `Result` and etc to C-friendly FFI interface.
+- A document instructs how to design C-friendly FFI signatures and write C/C++ header files, 
+involving how to pass primitive type, enum type, string and Rust specific structs like `Option`, `Result`.
 
 ## Why not XXX?