Turned the repo into a Cargo workspace, with r701 as a member

Moving the library into its own r701/ directory makes room for the
Tauri GUI client (Oxibadge) to be added as a sibling workspace member
in a following commit. edition/license/repository are now inherited
from the new workspace root instead of being duplicated per member.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -1,6 +1,6 @@
 <div align="center">
 
-# R701 🕰️
+# R701 | Oxibadge
 
 [![Rust](https://img.shields.io/badge/Rust-f74c00?logo=rust)](https://www.rust-lang.org)
 [![Claude Code](https://img.shields.io/badge/Claude%20Code-grey?logo=claude&logoColor=d97757)](https://claude.com/product/claude-code)
@@ -11,58 +11,16 @@
 
 </div><br>
 
-> A reverse-engineered library to communicate with the
-> [R701](https://ipsattendant.it/rilevatore-presenze-r701/) by [I.P.S.
-> Informatica](https://ipsinformatica.info/), written in Rust
+> A reverse-engineered client for the
+> [R701](https://ipsattendant.it/rilevatore-presenze-r701/) attendance reader by
+> [I.P.S. Informatica](https://ipsinformatica.info/)
 
-If you want to read about this reverse engineering attempt, check out
-<https://nicolabelluti.me/series/attendance-reader/>.
+This repository is a Cargo workspace with two members:
 
-## Library Usage
+- **[`r701/`](r701/README.md)** — the async Rust library that speaks the
+  device's TCP protocol.
+- **`oxibadge/`** — Oxibadge, a minimal Tauri + Svelte desktop client built on
+  top of the library. *(Coming soon.)*
 
-1. Add the library to you project:
-
-   ```shell
-   cargo add r701 --git https://git.nicolabelluti.me/nicolabelluti/r701.git
-   ```
-
-2. Use the library in you project:
-
-   This library is async and built on [tokio](https://tokio.rs); add it to your
-   own `[dependencies]` (e.g. `tokio = { version = "1", features =
-   ["rt-multi-thread", "macros"] }`) to run the example below.
-
-   ```rust
-   use r701::R701;
-   use tokio_stream::StreamExt;
-
-   #[tokio::main]
-   async fn main() {
-       let r701 = R701::connect("127.0.0.1:5005").await.unwrap();
-       let mut record_stream = r701.into_record_iter().await.unwrap();
-       let mut id = 0;
-
-       println!("No\tMchn\tEnNo\t\tName\t\tMode\tIOMd\tDateTime\t");
-       while let Some(record) = record_stream.next().await {
-           let record = record.unwrap();
-           let name = match r701.get_name(record.employee_id).await.unwrap() {
-               Some(Ok(name)) => name,
-               Some(Err(error)) => String::from_utf8_lossy(error.as_bytes()).into_owned(),
-               None => format!("user #{}", record.employee_id),
-           };
-
-           println!(
-               "{:0>6}\t{}\t{:0>9}\t{: <10}\t{}\t{}\t{}",
-               id + 1,
-               1,
-               record.employee_id,
-               name,
-               35,
-               record.clock as u8,
-               record.datetime.format("%Y/%m/%d  %H:%M:%S"),
-           );
-
-           id += 1;
-       }
-   }
-   ```
+If you want to read about the reverse engineering attempt behind the library,
+check out <https://nicolabelluti.me/series/attendance-reader/>.